Yes I’ve read the updates. They are babies for god’s sake- I have one. They really don’t take up much space , and all their ‘stuff’ doesn’t need to be in one room
One baby might not take up much space but two take up more twice as much. When you take into account the need for everything to be, at a minimum, at a higher volume - more wardrobe space, more toy storage, larger laundry basket for the additional washing that twins create, more bottles and other general baby paraphernalia etc - or double, especially with bulky furniture - cots, high chairs, car seats, prams, bassinets, walkers etc - and that they have their other children's stuff to accommodate in the same space and suddenl the extra storage space in their room is not a bad thing, especially when they dont actively need the space to play in.
Equally not everyone wants to spread their children's stuff through the house - my DD had a toy box in our living room when she was little and now she has bits and pieces in logical locations but for the most part the bulk of her stuff has always been stored in her room because it was out of the way and I always knew where to find it.
When my aunt had twins so much more of their stuff was stored in their bedroom because she didn't have space elsewhere. With previous children she could store toys in the living room, but now her older children's toys were there, so the babies bulkier stuff went in their room and was brought out as it was used and then returned; with two high chairs and a toddler needing a booster seat, the dining table didn't fit in the same place so other items had to be relocated temporarily, taking up storage elsewhere that would otherwise have been available for baby stuff; the hall cupboard was full of two car seats and a double pram, so instead of storing extra wipes/nappies there, they go in the nursery etcetc
I never said the SD’s feelings should take priority over everything, but she is a child who’s likely feeling insecure about the arrival of new siblings, and it’s not the time to kick her out of her space.
You said that her feelings should take priority. I think that the priority should be practicality and that feelings should be taken into account but DSDs feelings should not be top priority.
Perhaps the OPs DD1 is feeling insecure too - especially considering she is about to get two new siblings that will be around full time and are going to take a lot of the time she used to have 1 on 1 with her parents when DSD isn't there, should her feelings have higher or lower priority than DSDs?
Horrible lack of empathy here for the situation step children are in. I hope you don’t have any SC!!
It is not lack of empathy for SC, I have said previously that the situation should be handled in a positive way and DSDs feelings should be taken into account, but I disagree with DSD being made the priority over everything else.
At the end of the day the OP has to make a decision that is practical for the whole family and as long as she has a good relationship with her DSD and handles the room change appropriately, framing it positively, including DSD in the redecorating process etc then I dont see why DSD should be treated any differently to how it would be handled if DD1 needed to move (ie, to just decide the rooms needed swapping for a practical reason and do it)