Me and DP have a 3 month baby. Baby son sleeps in crib in our room and will do until six months. The problem is where to move him to after that. We live in a 3 bedroom house, DP has an 18 year old son and 11 year old daughter. DD stays every weekend and has box room. DS rarely stays as he goes clubbing at weekends now but historically he slept in double bedroom. DS doesn't keep any belongings here, literally just one pair of pyjamas. His mum lives 5 mins away and he has a permanent bedroom there.
I suggested we start decorating double room now for baby and include a sofa bed so when 18 year old (or any guests) stays he can sleep there and baby can come in with us. DP hated this idea as it might make 18 year old feel pushed out. His suggestion is that baby son and DD share a room. I hate this idea - it means moving them both if we have weekend guests, there'd be a room sitting empty most of the time cos eldest not around, I'd have to creep around DD when settling baby in night, DD has loads of stuff and baby is getting that way so sharing compromises space, won't be long before DD is teenager and needs privacy, DD is SEN and I worry she would try to help with baby and be unintentionally dangerous e.g. trying to pick him up.
But DP still doesn't agree and keeps putting off conversations about it.
Is my suggestion for sleeping arrangements unreasonable?
WIBU for me to speak to DS and explain where I'm coming from to see how he'd feel about it? (We get on ok but he rarely says more than 2 words to anyone so not sure it'd be a very revealing chat).
FWIW my own parents separated and I know how shit it can be for kids at any age so if I thought it'd cause trauma I'd never have suggested the above.