Documents show mother accused of killing her children tried to blame someone else for their deaths

New details from court documents show a young mother who was arrested in connection with the death of her children allegedly tried to blame someone else for their deaths.

Brittany Velasquez's two children, two-year-old Christopher and nine-month-old Brooklyn, were found dead in a car outside their family's home in Superior.

"My grandparents raised them pretty much because Brittany, she was kind of a little deranged," said Brittany's brother, Vincent.

Who was in charge of the children the night they were found dead strapped in car seats outside of the family's home. Police released probable cause statements in the wake of Velasquez's arrest. Documents show that Velasquez was the last person to see the children alive at 9:30 a.m. Monday, telling police that she dropped the kids off at a babysitter before going to work.

Velasquez reportedly pinned the blame on her grandparents, who she claimed were supposed to be watching the children.

"What my grandparents could only do is let Brittany stay at their house," said Vincent. "Really, that was all they could do for the kids."

Family had concerns, but friends saw a different side of Velasquez.

"She was actually a really good mom," said Marisa Gutierrez, during a phone interview. "She longed for attention and love for a long time. When she had her kids, it felt like she finally got that love and attention she was longing for."

Documents say police saw condensation inside the vehicle when they arrived at the home at 11:00 p.m., indicating they were inside for hours. Brittany's grandmother told police that Velasquez's car never moved during the day.

"Everyone knew, and it's kind of mind-boggling that after this happens, after talking to a lot of family members, we don't want to say, 'we told you so', which it sounds horrible, but in the back of our minds, it was always the worst case scenario that we knew was possible," said Vincent.