<p>I must be a horrid parent. We have a 3 bedroom house and raised 4 kids in it. They shared bedrooms and one is bigger than the other. The two younger girls needed a bunk bed since two twins would not fit.
When my oldest went to college, we moved her stuff to the basement - moved the two younger into the big bedroom and our rising hs freshman into her own room.
My oldest got over it.</p>
<p>When the second went to college - her two younger were in high school and they got their own rooms. The second never came home anyway and she got over it.
At 23 and 27 have not seen any long lasting emotional effects from either child.</p>
<p>I vote for having your son take the attic.</p>