The case involves Ofelia Garcia Ortega's 14-year-old daughter and the teen's father, Sergio Galvez Perez, who is suspected of impregnating the girl.
The California Highway Patrol is warning the public to beware of fraudsters posing as "AMBER Alert representatives" offering to "register" children.
A 17-year-old that was allegedly kidnapped from her home in San Jose on Friday night in a brazen assault in front of her father has been found safely, police say.
The parents reportedly left with the two kids through an emergency exit and left behind their 15-month-old child.
The siblings were allegedly abducted by their biological parents in South L.A. The four haven't been seen or heard from since and could be anywhere in the country.
Update: An Amber Alert issued has been canceled for a missing 14-day-old baby who was allegedly abducted in Solano County, authorities said on Saturday.