I am at a loss. My FI has 4 children, ages 16 (G), 13 (B), 11(G) and 8 (B). The 16 year old is kind of out there right now, and I've only met her a couple times. She stays with her mom full time and doesn't really want to come to FI's house very often because there's discipline there and he won't let her run wild. The 13 year old is in mom's full custody but is at our house pretty much every day after school and all the time over the weekends and school breaks. The older two are not FI's biological children, but he's the only man who's really been a father to them since their dad is in prison until they're both grown. The younger two are FI's natural children and he has physical custody of them, though they do go to mom's house often. Got all that? It took me a while.
The kids mom, who has refused to meet or even speak to me even though I'm with her kids more than she is, is nuts. She's angry because she cheated and the man she saw as her meal ticket left her (FI). I'm positive that she's speaking against me to the kids every chance she gets, but there's no way to know that for sure.
I get along with the kids, but after a year of living in the same house, I really don't feel like we've formed the kind of connection I had hoped for. I will admit, I don't have the chance to do very much fun stuff with them, either due to lack of money or maybe I just have a lack of imagination with younger kids. I worked with teens for years, I'm really great at dealing with them, but younger children mystify and scare the heck out of me.
I think the kids know that I like them and they like me, but I think they still think of me more as just there for their dad and not for them too. I don't want to force myself on them so I haven't been as open and affectionate with them because I wanted them to feel comfortable first. For instance, I'm a hugger, yet I have only held each once or twice when they were sick or needed comforting for some reason. I laugh and joke with them, and the 11 year old is now comfortable sharing girly secrets with me knowing I will only tell her dad if it's the kind of secret I can't keep and that I would tell her first. They all seek me out to tell me about their day and what's going on, but the love isn't there, even though the desire for my attention is.
What am I doing wrong and how can I fix this without coming across as buying them off?