I'll try not to drip feed...
Daughter nearly 3 and step son who is 8 (and autistic which is relevant to this). We have ds every weekend and 1 day midweek, it's been the set up since he was 1.
Every weekend when thinking of plans, Dp will say 'well, DS will want to play with his friends, so a weekend around the house'. Which is absolutely fine some weekends, but obviously dd is too young to be content with playing with ds friends as they are 10, 11 years old. We do try and play hide and seek and other games etc. Ultimately after working all week, I want dd to experience other things too. Invariably most weekends I then book (and always take) her to soft play for a few hours on the Saturday so she gets to do an activity she enjoys. We never get to go out as a family as ds 'doesn't want to go' or, according to my dp, will kick off if we do. He's happiest on his i pad in doors (sometimes with friends). I feel weekends are therefore dictated by ds (through dp). Before dd came along and obviously when ds was younger, we used to experience so much every weekend. I can't help but feel dd is missing out. My dp has taken ds to loads of places around his passion (weekends away abroad etc.) and really indulged his hobby. He is very very spoilt by both mum /dad but again dd misses out. Basically, I'm the only one booking or thinking of activities for her.
Dp and I have just had a row about thinking of plans for this weekend. I've said 'it's going to be sunny and nice, any ideas what we can do?', Dp has replied 'well, ds will want to play with friends' I've said 'yeh no probs, let's do that for one day and then the other day let's go out, maybe to [outdoor play place near us]'. Dps response 'no, ds won't like that, he'll either refuse to go or meltdown when there'. His autism means he is prone to emotional outbursts but mostly he is fine. I just feel ds has always been pandered to by everyone but now dd is missing out.
What do I do? Dps dad thinks we should have ds every other weekend as he can sre the effect and stress it's having. Dp won't do this as he feels he would be hugely letting ds down (which I can understand). Would be interested to know how other blended families make this work.