Two sisters who are related to the couple told ABC7 they think their brother had something to do with the deaths.
"We would like to make a plea for him, for our brother. Please come turn yourself in. We know what you did was awful and terrible, but please, don't let them catch you in the street. It's just going to be more tragedy for the family," said sisters Renesa Peterson and Debra Simmons.
So far, police have only confirmed that it is a death investigation.