In my opinion yes because if he really wants to become a family man he will try and that's all you can ask. But be careful as it is hard for people to change although they do it all the time. But yes...
This phrase doesn't exist in Hebrew.Family man = ish mishpakha (איש משפחה) but it sounds in Hebrew like you're talking about any adult male family member, such as adult sons, uncles, fathers,...