'Bring our babies home': Parents of missing Texas mom make tearful plea to find her and their granddaughter and claim she has NOT run away as the FBI steps up its search

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The parents of a Texas mom, who disappeared with her newborn baby girl, have made a tearful plea to find the pair, saying there is no way their daughter would have left voluntarily.

Heidi Broussard, 33, and three-week-old Margot Carey have not been seen since the morning of December 12, when Broussard dropped off her son Silas at his Austin elementary school. 

Now Heidi's parents have begged for their safe return, with mom Tammy telling KVUE: 'We miss all of them very much, and we want them home. So, anybody who has her, please let them go – just let them go – and it'll be alright.'

She added: 'Heidi wouldn't do this, there's no way. She loves her son Silas and she would never do this, and she would never take Margot down those stairs without her carrier and have her strapped in and her diaper bag strapped to her back.'

Heidi and baby Margot were reported missing by Broussard's fiance Shane Carey, who is also Margot's father, at 7.30pm last Thursday.

The FBI and Texas Rangers have now joined the search efforts for the pair. FBI agents were spotted scouring the home where Broussard lives on Tuesday.

Heidi's parents David and Tammy Broussard, pictured, have made a tearful plea to find their daughter and granddaughter as they say there's no way she would have left voluntarily

Heidi and Margot, pictured, were reported missing last Thursday by Broussard's fiance Shane Carey, who is also Margot's father. The FBI have now joined the search efforts for the pair

Carey, pictured, gave tearful TV interviews saying that he didn't believe Heidi would leave on her own accord. He denied any involvement in the disappearance of his daughter and fiancee

David and Tammy Broussard traveled from Lake Charles, Louisiana after news of their daughter and granddaughter's disappearance.

David said: 'We've just been hoping and praying that they find some clues to my daughter's disappearance. I've just been going out in the surrounding area and looking, hoping and just doing a little detective work.

'We're not giving up. We don't believe in anything else but Heidi coming home.' 

Tammy added: 'We're just trying to do everything we can to let them know and let the public know that the authorities are doing their job, and we want to bring our babies home.' 

Police, who have given few details about the investigation, said at a Tuesday press conference that they currently had no suspects in their disappearance.

Detective Brad Herries said investigators are currently working on the assumption that Broussard and her daughter have not been harmed. Herries said authorities are exploring 'every possibility' and at this point are assuming they are alive.

'It´s possible that Heidi and Margot have left on their own accord,' Herries said. 'It´s also possible that there may be something nefarious or foul play involved.'

He said police do not have a person of interest in the case. 

Herries refused to confirm or deny whether there had been previous domestic callouts to the family home but did say past police contact is part of the investigation, along with social media posts.

Herries also refused to confirm if Broussard's fiance was a suspect. 

It comes after Carey gave tearful TV interviews over the weekend saying that he didn't believe she would have left on her own accord.

In one interview with Fox7, Carey denied any involvement in the disappearance of his daughter and fiancee.   

Detective Brad Herries said investigators are currently working on the assumption that Broussard and her daughter, pictured, have not been harmed

FBI agents canvas the apartment complex in Austin where missing mom Heidi Broussard lives. Heidi has been missing since December 12 when she was last seen dropping her son Silas, at school. Her daughter three-week-old daughter Margot is also missing

Investigators are trying to determine if Broussard left on her own or if the pair are victims of foul play. Detectives have been interviewing her family and friends and reviewing surveillance footage from the Austin apartment complex where Broussard lives

Police believe Broussard returned home after dropping her six-year-old son Silas off at school before vanishing.

Investigators are trying to determine if Broussard left on her own or if the pair are victims of foul play.

Detective Brad Herries, pictured, said authorities are exploring 'every possibility' and at this point are assuming they are alive

Detectives have been interviewing her family and friends and reviewing surveillance footage from the Austin apartment complex where Broussard lives.

Carey said he last saw Broussard when he left for work at around 6.40am on December 12.

Authorities said Broussard arrived at the school with Margot to drop off her son at around 7.30am. A surveillance image released by police showed the mother at the school wearing a purple shirt about 20 minutes later.

Carey said Heidi called him at about 8am to telling him she had bought some books for Silas at a school fair. He said he tried calling her again at around 1.40pm but her phone was turned off.

Carey arrived home from work at about 2pm and said Broussard and the baby were not there. 

He said Broussard's car was unlocked and her purse was inside with her ID and bank cards still in it. Carey said her keys and cellphone were the only things missing.

Carey said he got a call from Silas' school soon after saying Broussard hadn't returned to pick up her son.

He said he went to pick up the boy and that Broussard still wasn't home when he returned. Police were notified several hours later.

Broussard is described as standing at 5-foot-3 inches tall, and weighing 150 pounds, with long dark hair with highlights. Margot was born on November 26, 2019, and weighs about 7 pounds, 7 ounces. She is roughly 22 inches long

Heidi's car is still parked outside the apartment she shares with Carey, pictured

Carey told Fox7 that when he first noticed Broussard was missing, he walked around the apartment complex 'going through dumpsters' to see if he could find her keys.

'I sat outside to see any suspicions, anything that was weird,' he said. 

'The next morning I sat out here for hours asking everybody if they'd seen or heard screaming, anything that was off or suspicious. They're all saying no.'

Carey repeated his account in a phone interview with KVUE on Sunday during which he appeared unsettled and overwhelmed.

'Okay I'm gonna I'm gonna call you back or something, I don't know what to do man. You make me nervous, you know...I just want to be natural man,' he told the reporter.

'I just want to like... this is not... I don't know... get the word out there.'

He added: 'I don't know why anybody would ever harm or touch these two beautiful women together.'

Carey begged anyone with information to contact him or authorities and pleaded with the public to share social media posts about her disappearance.

'She would not do this by herself. She would not be doing this. This is definitely something that happened that was wrong,' he said.

'She is an amazing person. She has amazing support, friends behind her. She's so personable – one of the best people I've ever met, so kind, and she does anything for her kids – one of the best moms.'

Carey said that when he first noticed Broussard was missing, he walked around the apartment complex 'going through dumpsters' to see if he could find her keys. The couple are pictured 

Broussard is described as standing at 5-foot-3 inches tall, and weighing 150 pounds, with long dark hair with highlights.

Margot was born on November 26, 2019, and weighs about 7 pounds, 7 ounces. She is roughly 22 inches long.

Anyone with information is asked to call police by dialing 911 in Austin, or directly at (512) 974-5017.