Bedrooms...

Question:

So my husband and I got a four bedroom townhome so that all our children could have their own rooms when baby comes in two months. Now two rooms are upstairs and two downstairs one right beneath the master bedroom.

My husband has decided that our son (6yr old) can’t sleep in his own room downstairs (he has always been in his own room just same level as us) alone cause it will be scary and instead wants to put the 6yr old bed in the bedroom across from us (which is the nursery I’m getting ready this having both kids end up sharing (his bed is huge!) and leaving both rooms empty downstairs essentially until he feels my son can handle being down there.

Personally: my family actually grew up in the house when I was little and I Had the exact room he is supposed to have underneath my moms room and she could hear everything.

I feel very strongly that he is used to his own room. He had no issue with being scared to sleep in the lower level until his grandma told him he should be scared to be all alone down there. I would like to give him an opportunity to just keep his own room as planned and if he wants to be upstairs with us consistently then consider changing his bed at that point.

Advise requested. Am I fair for saying our son is a big boy and can handle keeping his own room on the level below us right beneath our room

Is my husband right that he should have the upstairs room until his dad feels he isn’t “scared” anymore (which he isn’t but who knows) this will force either the newborn to share his room then and leave two empty rooms downstairs Help a gal out?