@beverlybothered how old are your DSC? I ask only because I think that one fundamental thing which almost everyone loses sight of when talking about children, stepchildren, biological children etc is time, and the fact that what is now won’t necessarily be tomorrow, but it could be if people act in haste rather than just biding their time and allowing things to happen and progress.
So e.g. when my ex got together with his partner she had a child of her own. My DC had been an only child until then and because the other child was somewhat younger and he had never been a part of a sibling (step or otherwise) group until he became.a teenager he had a lot of resentment towards her. Ironically this manifested in them arguing a lot, not unlike actual siblings, but the parents took it badly because they wanted them to be like loving siblings which they weren’t.
However, I remember having a conversation with DS along the lines of that actually, they’re not going to be the ages they were then forever and as such he shouldn’t think that what is now (as in then) will be for all eternity, because they’ll both grow up, forge their own paths in life etc. A few years on and they actually get on better, unfortunately a part of that has happened because of the partner and the things that have happened between her and her child which I won’t go into here but which have also formed a part of DS’ feelings towards the partner iyswim.
Conversely however we see posts on here from people whose children (biological and step) are still tiny and who find it hard to see that those relationships also change over time. I remember when I got together with my own partner him being excited that my DS and him got on so well. Others who had been there said to him that times do change, and there will be times when he feels that things aren’t going so well, even I said that. Now DS is a teenager in full swing and although he and my DP do still get on extremely well, my DP has found the teenage attitude, the lip and the backchat difficult to deal with sometimes because he sees it as a rejection of him wen actually for the most part it’s DS being a teenager and is few and far between in amongst the times when DS is lovely, helpful, and we can have almost adult conversations.
By the same token my ex’s partner’s behaviour has meant that DS doesn’t want to go there any more at all. The response from my ex has been to call him immature, say that she just shoots her mouth off and he should just accept that (but they can’t accept how he feels?), and all the blame has fallen to my DS while we must accept that the partner (a grown woman) is just like that.
To add to that I have a life limiting illness, and my ex has told him that in the event I get ill (or worse) he won’t be able to stay there any more because of his attitude.
DS is now old enough that that kind of talk is potentially going to destroy life-long relationships with his dad, which is a shame because despite the things I have rwritten here he is perfectly capable of being a good parent, and I know for a fact that he has done the parenting when DS was staying there, has done the clearing up, the washing, the buying of clothes etc but all that has been lost in the attitude he’s taken over his partner.
It didn’t need to be a one sided discussion. She is culpable for the things she says, for screaming insults about me in public places etc, and while it might be difficult for ex it’s something he should be addressing, because right now she’s doing that in front of his teenage DC, soon it’ll be his baby DC. And one day the baby will grow into a teenager with all the attitude that entails, and the daughter will be a teenager sooner rather than later, and there are no guarantees then either.