What do i do my children father came and took them when i was at work

You have had the children since the birth, how did he just came and took them? Who gave him the key to your house? Is there a legal custody order in place? If not then you should contact the police. There could be more to the story. So the first thing you should do is contact a good attorney that will listen to your situation and then work with you to go over your options in getting your kids back.