We have just moved into our new house. We very purposefully bought a 5 bed so each of the kids DSS (19), DSD (16), DS (12) and DD (7) could each have their own room. Two of the kids bedrooms are slightly larger in area than the other two. I had planned to give the smaller two bedrooms to the stepkids on the premise that they aren't here as much but DSD is quite upset. She ran through the house and declared a bedroom "hers". She's fairly upset at not being given that bedroom and now the younger two are offering to give up theirs which is very sweet but feels wrong. Am I being a cow here?