This got nothing to do with ttc but need advise

My ex partner never had contact with me since 2010 when i was pregnant he is abroad and im in uk no calls or messages and when my daughter was born he or his family never bothered his sister told me he was never interested in me or the baby. Even on her 1st birthday he never sent her gift and thats when i and my baby girl met my now husband who adores my daughter to bits and my daughter is the one to choose him as her dad she is so happy since he came into her life she sleeps wid him he baths her feeds her changes her nappy and now he even potty trainned her. Cuz his case is going on for his stay and he wants to adopt my baby. What is his chances. Wha if her biological father refuses. I dont know his address or his number i forgot. I know he has got facebook thats all.