my daughter's bedroom: la chambre de ma fille
my daughters' bedroom: la chambre de mes filles
'the bedroom is ..' translates as "la chambre est ..." in French.
bedroom of the parents
la chambre de ma soeur
The bedroom is 'la chambre' (fem.) in French.
My bedroom is 'ma chambre' in French. This is a feminine noun, even when it's a boy's bedroom.
ma chambre
une chambre
ma chambre
You would say "J'ai trois filles" in French to indicate that you have three daughters.
chambre à coucher
"ma chambre est ..."
Mom's bedroom is "la chambre de ma mère."