longtompot
After looking again, you and your dh should have the living room as your bedroom, the dining room becomes your living and dining area. The baby goes in the box room, dss has the smaller bedroom and the two girls share the bigger bedroom. You then get a pod for the garden for your office. Much better than having a child sleeping alone in the garden, no matter how much of an adventure they'd feel it was.
Oh but there is a problem with that.
I dunno what but OP will come let us know real soon. 🤔
That did make me laugh @Danni91
I agree, I think no matter what we suggest, op is going to find an issue. Surely the baby grand should have come up sooner. Could it go in the pod?
The baby does not need a big room. When they do, dss will be of an age he won't be staying over as much, so the baby can go into the bigger room and you could do a futon or similar in the box room.
You need to be thinking of what will work for your family, and what they need. My ed has a cello, but it's had to be stored in our attic as she just doesn't have the space to play it. I understand your instruments are for your job, and not like my eds cello just something she lives to play, but they really should go in the garden office pod. Your family need somewhere safe and warm to live.