I think I understand this, but "crianças" are kids/children, whereas "filhos" are specifically your kids/children, right?
yes, and filhos = children, sons / filhas = daughters.
I find it helps to think of "filhos" as "offspring"
So how would we say, "The fourth bedroom?" Maybe "o quarto quarto"???
I see why you are asking this :-) My answer was "we have rooms for four children" mixing up fourth with four :-( perhaps this would be spoken at an orphanage?
are these rooms for the children ==your children===or to rent to other peoples children In the sentence it is not clear
It would be weird to keep rooms for strangers' children to rent all by themselves. But I have heard a lot about homeless street kids in Brazil, so I guess it would be nice of hotels to offer smaller and cheaper rooms for those children :)