Its about the dad wants to kill his children but the mum has taken them they move around a lot and every time they move they have to change their name and numbers and stuff but the daughter makes a phone call to her boy friend and the dad tracks them down. Please help

Give me more hints. Like actors or how they look like? Something like that so I can help

Not exactly as you described, buy maybe Family in Hiding (http://www.imdb.com/title/tt0824326/)