This is something I dread in the future as an NRP with my 3 year old dd. ( I live an hour and a half from her mum and her.)
That at some point she won't want to come to mine, she'll want to see her friends. It'd break my heart but I wouldn't try and stop it. I can only hope that she'll want to visit me too.
And there has been the odd instance where she's said she doesn't want to come with me when I've gone to pick her up. it's heart breaking tbh.
It's very difficult to know what to do ( or say ) . It's guilt inducing, you start thinking 'well am I taking dd away from her friends ( and more importantly her mum ) because of my own selfish reasons ( that I love her and want to spend time with her at my home ) ?' , 'should I just not have her at my place any more and just turn up at her mums and be 'fun dad' ? '
In my case dd's mother and I never lived together in the first place, we've always lived in different towns, and as such dd has to travel every other weekend with me. Again I feel dreadfully guilty putting dd through that, taking her away from her little buddies, sitting on the train or car.
And who would want to up and take a train when you're having lots of fun where you are at the time. Thankfully she's reluctant to go back to mum's sometimes which puts it all into perspective.
However, I do make a real effort to get down to dd's level. Other than her watching a dvd in the evening whilst I cook diner we're always playing together, or swimming, or walking, flying kites, looking for bugs, drawing etc etc. I think that's fairly crucial. I know I need to be her play mate as well as her dad as I don't have the same kind of child based social group that mum does through nursery and the like. And no friends with similar aged children.
There's no ideal solution.
I do however at times see dd at her mums. If there is a party or some other reason I'll travel up to mums, back in the evening, and back the next day. It's rare but I guess it helps in the long run. I don't want her to miss important things, and thankfully her mum and I are able to be flexible.
I think it's a bit unfair to see dad telling his dc he misses them as guilt tripping them. I assume he loves them very much and does miss them. I miss my dd terribly between visits, I find it very hard not seeing her for a week, I tell her I miss her because I don't want her to think she's out of my thoughts.
anyway. if anything I'd suggest dad looks at what he does with dc when they're there. Playing video games or watching TV for hours on end whilst he works on the computer is not going to help them build a good relationship at all imo. That is the crux of the problem I think
best of luck