I've been with my DP for 3 years. We moved in together a few months ago (we've rented as a trial to see how it goes before committing to buying).
DP has his DS9 regularly. I have a DS13 but we have opposite weekends so there's not huge amounts of interaction between our DC. They do get on though.
This may be completely normal and I'm just not used to it as this is the first time I've lived with someone who has DC. Whenever DSS is at ours, the whole weekend is centred around him. Where we go, where we don't go, what we eat, what game we play, what we watch on TV etc.
I know when my DS goes to his Dad's (even when he was younger), it was all very much a 'family' decision and DS also had to tidy up after himself etc.
Me, DP, DS and DSS were going somewhere a few weeks back, tickets bought, then last minute DSS decided he didn't want to go. So we didn't.
When DSS is here, DP turns in to someone I don't really recognise. He'll run around after him, follow him from room to room, there will be no discipline and I find it exhausting to watch.
I get on well with my SS - he can be a little spoilt but he's not a bad kid at all. I also make sure that DP and DSS have plenty of time on their own.
If all of this is what normally happens then that is absolutely fine, but I wanted to ask on here as the only thing I can compare to is when DS goes to his Dads.