We live in a 3 bedroom house and have two DC, DD who is 4 years old and DS who is 20 months, they have a bedroom each. We've been thinking about whether to have a third and both me and DH want to but he's not keen on having DC share a room. This is difficult because it's unlikely we'll able to afford a house any bigger. DH thinks it would be unfair, especially as they get older and need their own space which I understand but I wouldn't say it's absolutely necessary for children to have their own rooms and they might be fine with it