My dsd's mum has 4 chidren with different dads.
They have varying degrees of contact from dh - every other weekend, half the holidays, full involvement, big extended family, to occasional contact if they happen to be in his area, to two with no contact at all. She stopped all of the Dads from seeing the children when they split up, dh was the only one who went through the Courts.
Dsd has been asked not to go home and talk about all the things she does with us because the others don't get the same. They compare Dads and dsd has said that when they are having arguments she's said things like "well at least my Dad sees me".
It must be really hard for them to see dsd going on holiday with us, weekends away, parties, weddings, coming home with new clothes, easter eggs etc etc. We don't spoil her by any means, just all the normal stuff and exactly what we do for dd. We can't treat dsd differently to dd, but her mum and other siblings are left to deal with that and that must be hard.
And, of course, they have to put up with knowing that dh didn't just walk away when they split up, the know about the court proceedings and court orders (because she doesn't believe in keeping anything from them) and I'm sure they must wonder why dh did all that for dsd and their dads didn't.
Then when it comes to Christmas - dsd spents alternate years with us and her mum. This isn't an issue for us as the other dads don't see them , but if they did it would need careful organising and negotiation. You may never have all your children together for Christmas or at least on some years you may not have.
I realise your situation is probably completely different, but I suppose my point is that it isn't just about how you are perceived by people, have a think about what it will it be like for the children