There was an article in Woman magazine I found at my mums and was reading (not sure if it's 100% up to date). It told the stories of three mums that were terrorised by their step kids until they either broke up with their new partners or the partners chose their kids over them.
Obviously I understand lots of couples break up and there is no one to blame. But this article made it seem as though children are like dogs that need to be trained into respecting these new 'parents' in their life. Even now being a mum myself, if my dad cheated on my mum and I was introduced to her, I would be nasty as anything to her for wrecking their marriage. Just because you can control kids I don't understand why it's fair to say they have to respect new people in their lives that in essence ruined their old lives and famillies