I think the chances of INFP being good husbands and fathers increase as they themselves are satisfied as individuals. So, I would tend to advise INFPs to only build relationships of great responsibility after they've matured quite a bit. By matured, I mean learn what they need, want, can't stand, and most of all work on their greatest weaknesses... particularly anything that brings out the worst in them... they should get to a point where they have it recognized and under control. Then, combined with their devotion and integrity, INFPs should make fantastic partners and role models.
-----Another stray piece of wisdom. As I've said before, male INFPs grow up in an ESTJ world. Like rubberbands, we try to expand to the world's expectations, but we become too stretched, and we snap. ESTJ is the shadow side of the INFP. Once we sort things out, we become comfortable with who we are. Then, finally, we can be who are.