Mystery of missing Idaho children leads police to look into family

Investigators believe the mother, Lori Vallow, and her new husband, Chad Daybell, know where the children are or what happened to them.
1:28 | 01/02/20

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Transcript for Mystery of missing Idaho children leads police to look into family
Now to the growing mystery around a brother and cyst whole appear to have vanished. Tonight, the new developments in the case and the intensifying search for answers. Here's ABC's chief national correspondent Matt Gutman. Reporter: Tonight, police searching for an Idaho brother and sister confirm they are now investigating a string of mysterious deaths in the family. The whereabouts of the parents are unknown, but investigators believe mother Lori Vallow knows where the children are or what happened to them. Police are now looking into three deaths. Vallow's brother, along with the couple's former spouses. Even exhuming the body of husband Chad daybell's first wife. There was a number of issues that just didn't look right. Reporter: 17-year-old tylee and 7-year-old J.J. Last seen in September. Their grandmother is worried sick. What kind of mother won't cooperate with the authorities? Reporter: Brandon Boudreau married into the family and believes Lori joined a religious group founded by daybell, who has authored books about doomsday. I don't know why they're doing what they're doing. It doesn't make any sense. I don't know what happened to those kids. But I know there are people who do who are not talking. Reporter: Boudreau says he was almost killed in a drive-by shooting. Police confirm they are investigating that incident, too. Whit, there are now investigations into those missing children and those three mysterious deaths in Idaho and izona. Now, the couple said through an attorney that they want to address the allegations, but only once they have moved beyond, quote, allegations and rumor. All right, Matt, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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