Authorities Friday are trying to identify and determine the cause of death of four people, including two toddlers, found dead in a van in a parking lot in Garden Grove. Garden Grove PD officers who responded to the scene Thursday night saw no apparent signs of trauma on the bodies. The windows on the white Honda van, which was backed into a parking space in the far northeast corner of a CVS store parking lot at 12031 Brookhurst St., were concealed with blankets and a sunscreen, according to a GGPD news release. A homeless woman called police around 8:30 p.m.…