Would you be okay with your partners or spouses family having no relationship with your children from a previous relationship outside of being polite / friendly when happen to be face to face.
I.e. not getting a birthday card for them, only asking if they had a good one when they see them next which could be weeks after, being fantastic and really involved with joint DC but having no real relationship at all with stepchildren, arranging days out with joint DC but never suggesting SC go etc..
Basically would you accept in your relationship or marriage, your partners family having nothing to do with your children from a previous relationship outside of being polite when face to face.