I have been divorced from my ex husband going on three years. We had three children together.For about two years my ex has been in and out of the children's lives. For about a year now he has not seen, or had any contact with the children. He is involved with drugs, in trouble with the IRS, and does not pay his child support. I am building a case against him to terminate his parental rights altogether,but in the meantime I want to change the children's last names to mine instead of his. I have tried to contact him, but I can never get a hold of him. I am not even sure where he lives anymore. I have done alot of research on the subject, and know some steps I can take. I just want to throw it out there, and get an opinion. Thank you.