I think you are describing it best, except the kisses almost look like the tongue is involved and just not like you would expect for a dad. It doesn't help that this guy also has done some extremely irresponsible things in his life recently and their relationship (he and my daughter) has horribly dysfunctional with endless bickering. They have divorced and are not actually living together anymore, but he is there a lot. Bottom line is I hope there is no reason for concern, but I just don't want it to be one those just-ignore-it-because-it's-not-my-business situations that go bad and then regret not being more proactive. Thanks a lot for your insight.
Can you be more elaborate about the kisses? I agree that some children (usually babies, actually, with spitty little mouths) try to kiss your mouth with theirs open. Is it a quick kiss or is it the kind of long kiss that would make you uncomfortable even if two adults were doing it?
It's hard to get a picture of what you're saying. There are fathers who treat both daughters and sons more like playmates, teasing and carrying on and wrestling and giggling and not taking an adult role model of leader, but rather, the way two children would play with each other, but it's not sexual - it's just inappropriate for a parent.
Does that sound like what's happening?
Most of it is not that bad. Many young children give their parents open mouth kisses. All dads whisper and tease their kids, it's part of being a dad. The crotch part is pushing it, but she is so young that right now it isn't that big of a deal.