Liliana Carrillo, 30, was arrested Saturday after she allegedly killed her children
The kids, aged two, three and six months, were found dead at Carrillo s LA home
Children s dad, Erick Denton, revealed that Carrillo struggled with postpartum depression, had suicidal ideations and self-medicated with
marijuana
Denton s cousin, Teri Miller, also said that Denton had been fighting Carrillo for custody of the kids months before they were killed
Miller said Denton had repeatedly contacted child protective services for help
Denton noted in a petition that he believed Carrillo had lost touch with reality
The Department of Children and Family Services (DCFS) did not immediately respond to a DailyMail.com request for comment on Tuesday morning