I think this is a zombie thread and it doesn't look like ops coming back. Which is a shame tbh but I can understand why.
The battshittery of people suggesting op move out because her kids are referring to the step dad as a step dad.
I think in life there is always a stage where kids may have big emotions but we as adults aren't supposed to jump in and go right this needs fixing asap and have a big emotional response. It's a sad situation for the kids, both sets for different reasons but ultimately those reasons happened because of the adults and there isn't anything that will change that (unless both op and her dh get back together with their former partners)
Dad in this scenario has them nearly 50/50. It does suck that their parents split up and that's their living arrangements but that decision was made by two consenting adults (mum and dad)
,Life isn't fair, and by pretending to kids it is your setting them up for failure because if they go into the world thinking oh the world must move because I'm upset.. they are gonna have a shock when they are older.
Op this isn't one you can solve and ultimately it's down to dad to reassure his kids and spend one on one time with them.
This is a situation of not fixing but letting the emotions be h Th e emotions of both sets of kids and helping them process them in a safe space without doing something bonkers like young children dictating adult relationships.
If you had split up with your children's dad because of dv and the kids were sad they didn't get to see daddy. No one would be like Well the kids need you to move back in with dad and out the kids emotions first fuck your own:
Jesus MN really hates blended families or maybe just breed dysfunction idk