To ask what to do about bedrooms?

[Bedroomdilemma]

Name changed because giving identifying details...and posting here for traffic so already unreasonable. We have 4 bedrooms, big one with en-suite & super king for dh and me, second biggest for 6 yo, box room for 3 yo and final one with a double bed for 17yo DSC - who only stays overnight about maybe once/twice a month currently - as well as frequent family guests as we both live a good few hours from family. Baby currently in with us. Always intended that 6 yo and 3 yo would share, baby in box room and on the cusp of buying a bunk bed and doing up the room properly, and baby in box room. However they fight ALL.THE.TIME. It’s currently the worst thing about parenting for me. Will sharing a room make this worse, anyone any experience?So wondering should I give the boys the two smallest rooms, and put double bed in second biggest room, plus cot in a few months, to be used by baby and DSC/guests, taking baby into our room when needed? With 1st child we cosleeped til 2, but 2nd child was a nightmare to cosleep with, don’t know how this one will be in longterm (currently cosleeping now). Need to make a decision soon as have to buy furniture - baby’s stuff currently all over our room in bags...

YANBU - put children 1&2 in separate rooms
YABU - have them share

Well I'd talk to them. but the options are:
6 and 3 share and don't cause trouble.
6 and baby share and get the bigger room.
3 and baby share and get the bigger room.

I would give all your kids their own room but put a big double bed for your 6 year old in the biggest, bunk beds in the second for your 3 year old and the baby in the box room. I’d tell the 6 year old that they have to give up their room and bunk in with the 3 year old when people come to visit. My eldest has a lovely room with a big bed but on condition she gives it up for occasional visitors. She moans but it works fine. I’d always prioritize people living in the house over occasional guests personally.

I’d always prioritize people living in the house over occasional guests personally

But then you kick your 6 yr old out of her room when visitors come?!

Step child in box room, 3 yo and baby share big room, 6 yo has smaller room to self?

I'd do double bunk bed in 6 year olds room, and all have their own room. Then when dsc or other visitors come to stay, they can share with 6 year old.
Having had my children share for 9 years, I'd always go with own room option if possible,.

Hmmm, so nobody is saying have baby in big room even though there’s room for a double bed and cot? Think dh will be resistant to DSC not having a bed, even though will be an adult by the time baby is moving into the room. Guests can be as frequent as every other weekend, or even every weekend. DC3 is currently the most difficult child at night and to share with. DC6 adores sharing a bed with us and is easy to sleep with, but don’t know how long that will last. Baby and DSC are same gender, the other two the different gender.

Also think 3yo and baby will be the most difficult - we still have all the teething, frequent nightly wake ups etc to go through with baby, and that will disturb the 3yo.