Yes. Seeing him One Night a week and spending no one on one time with him is basically 1%. In my eyes, It's basically a nicer way of being a deadbeat. This way the Dad can say 'Look, I'm involved with my kids', while not acutally being involved with his kids much at all.
Considering that fact that the contact was halfed as soon as the baby was born, I think it's a reasonable assumption and even if this isn't the case, she has certainley given it her approval if it has been going on for this long. In my opinion, staying with a partner who emotional rejects the child is contributing is cowardly. She is a willing participant in this.
Currently, this women has to literally 99% of the work. All OP does is make sure his child is physically safe, while literally planning everything else around his new kids. I agree that his new wife shouldn't be babysitting the kid. However, you supporting the reduction in custody because of this preposterous. Why should must the child be victim of this? What should have happened is she should have said no to babysitting. That's literally all that needed to happen. Reducing custody is taking it out on a innocent kid.
I completly understand the need for sharing a room. My Stepkids and BioKids share a room but look at the pattern. This child has already seen his time with his dad cut in half. He then gets contact time cut even more when they decided to go on Holiday (which he rarely gets). Everytime he sees his Dad it's about his new kids and he has to see them get new toys and gifts everytime hes there.
If the kids share a room he needs a proper bed. Not a Pullout bed that's made for a guest. He also needs an area for his toys and such. However, considering all the other stuff that has gone on, he won't be sharing a room. It'll be his brother room, decorated how his brother wants with all his brother's toy all over it, while all OP's kids get is a pullout bed and nothing else. It'll be like a guest room for him.
Finally, I am second wife. I have both Stepkids and Biokids. I just have a diffrent opinion because I don't want to emotionally damage my kids in to adulthood and I don't have permanent victim complex. Stepparenting is hard a people are allowed to vent, that being said there is a diffrence between venting and damn right hating a child and the fact your partner had a life before you.