My daughter and her 2 kids live with me. She does not work but gets welfare and food stamps. I worked and earmef 3400.00 and then collected disabilty. She does not pay rent or help with all of the bills

Can i claim my grandkids as dependents on my taxes or will benifits be stopped  for her? My house hold bills per.month are more then she gets so i pay more and maintain a house for all of them.