Quoting Ozzie & BamBam:" Out here once your proved the biological father they are automatically put on the BC. but I just found my answer he cant do it http://www.dshs.state.tx.us/vs/reqproc/faq/paternity.shtm"
Yes, once proved the bio. father it is to be placed on the BC, but she was also court ordered to change my nephews last name on the BC to reflect his fathers last name.
He has legal rights to take you to court to change his son's name. There is nothing in print stating he can't because that is his right.