Apologies for the length. I will get to the question eventually!
DH has two children, DSD and DSD (both between 9-14). We have regular contact with them. Things were great at first but not so much for the past while. Reading posts on here in the last week has saved my sanity - I really thought I was alone, but it's an all too familiar story.
DH and DHEXW split up quite a few years ago following her affair. She went on to move her DP (that she had the affair with) into the FMH a month or so later and not long after got pregnant with new DP.
DH has had a couple of relationships, and generally DHEXW hasn't been too horrendous -awful to him but not interfering with his relationship with the DSC too much. She was ok with me at first - until it became clear just how happy we were and how well life was going for my DH. We do not even remotely rub this in her face, we just get on with life.
She has turned into a nightmare - and as far as I'm concerned, she's emotionally abusing the children. I have 3 DS and DH is brilliant with them. They're younger than his DSS, and obviously he sees more of them as we live together. He also facilitates a lot of the childcare arrangements (getting them to nursery etc) due to practical reasons.
He does not show any preferential treatment to them whatsoever, however. The DSS are constantly reassured that they are part of the family - though they constantly (especially DSD) try and make my children and I feel like the intruders. DH is brilliant and it doesn't impact our relationship - he's not blinded to what's going on at all. He has always maintained regular, meaningful contact, never missed a maintenance payment, never given her a reason to have an issue.
DHEXW is now doing what I have learned from here sadly is not uncommon - following links suggested, I think it's called parental alienation syndrome? It's horribly sad. She tells them that DH will forget about them, that he doesn't love them, that he loves my DC more, that he is an awful father (this in front of my children too). She tells them to tell him they don't want to come stay with us. She tells them to misbehave for us and that they shouldn't have to follow our rules - ones that haven't changed from before I was in the picture. As a result their relation with my DC is deteriorating, DH is in bits as they are almost unrecognisable as the children he raised and his relationship with them is in tatters, and they are clearly messed up. I know now why - she wants him to be alone and unhappy. She hates that he's just getting on with his life. I don't understand it, but I can see it's what's happening. I know it's awful but I dread them coming now. I know how horrible that is, but it's a constant strain, my children usually suffer as DSD makes every attempt to push them out and DSS (the eldest of the two) has physically hurt my DCs many times. They are allowed to tear strips out of each other at home, and carry on here - my children are all pretty young, and one is somewhat more frail than the others. He has jumped on his chest before - he has breathing difficulties. I find it difficult to remain calm, but I do.
We're trying our best. DH has tried repeatedly to talk to EXW, reasonably, about the impact it has on all of the children. She throws it back in his face and says that he does not spend enough time with the kids and that is why they 'resent' him - he regularly receives texts like 'I'm just doing you a favour hun[sic], if you don't sort it they won't want anything to do with you". She point blank denies having said any of the things she has - despite the fact she's said some of it directly in front of us and that we have seen evidence of it, as well as the DSS letting it slip a few times. We try and talk to the DSS but it unravels the second they return from DHEXWs house. We have tried everything. She just comes out with completely bogus irrelevant and fantastical statements. If this is done over a phone call she screams over him and he ends up hanging up the phone. She will often shout at him in front of the children and he has to walk away because he does not agree with this kind of talk - especially with shouting - going on in front of children. DSD is becoming more and more unpleasant and manipulative, because it works on her mother. I am struggling very much with her - though I hide it as best I can. Things just seem to keep getting worse. DHEXW is even going as far as getting in contact with DH's mother - who is a a bit of a sociopath (a whole other story, though he has no contact with her). She and MIL have never seen eye to eye - though apparently now they're quite chatty that they have common ground - to make DH's life difficult if at all possible. DH feels very strongly about her having nothing to do with DSC - with very, very good reason. It's not pettiness or spite, the woman is poisonous and dangerous. DHEXW is edging towards offering contact via her despite all of this. She refuses to tell him anything going on in DSS life and makes it impossible for him to find out himself. She encourages the children not to share things with him. And then accuses him of showing no interest in them.
Now - the question after all of that! DH and I are in a very happy, stable marriage. Other than this issue, our lives are brilliant and settled. We both very much want to have a child together, to add to our family. We know from conversations my DC have come out with that they would be over the moon with it. Things weren't great with my EXH at first, but for a while now have been on a very even keel - he sees them regularly and the three of us co-parent with pretty good success, very amicably. It won't cause problems in that regard.
We have been TTC for a a few months now, but there is this niggling feeling that I'm being incredibly selfish - that it'll cause further disruption with the DSC. Everyone else in the family and extended family would be over the moon. It is something we both feel very strongly about. But do we put this on hold indefinitely because of the damage DHEXW is causing? It's not going to get better any time in the near future, if ever. More than likely never. Do we sacrifice TTC when things aren't going to improve anyway? It's a genuine question. Should we put our lives on hold in this regard or is it reasonable for us to carry on?
I didn't mean to carry on for so long - I find it very hard to talk about for fear of being judged - the whole situation. I feel like the wicked stepmother, and like I'm getting it all wrong. As much as I would like help with the question above, I just needed to get it off my chest and feel like I'm not alone on this :(