My DS mentioned last night that his DF and STBSM have told him that once they have a baby, if it is a boy, it will be sharing a room with DS. If it is a girl, it will share with ex's NR daughter. My DS is almost 12, his Dsis is 13. DS stays with ex 2/3 nights a week. His Dsis stays there about once a month. Assuming there is a new baby in about 2 years, when my DS is roughly 14, AIBU to think it's not fair to expect him to share with a baby the nights he is at his dad's? This won't be in the current house, as they are planning to move. I know it's a while off, but what are your thoughts please?