We have a 3 BR house. When we moved in SD got a room but it was never really decorated. We tried to get her to pick stuff out but she wasn't interested. I figured if DH wanted it set up he could spend the money to do it. It became the SD/Guest room.
Back then SD never wanted to stay over she would sleep at our house maybe 3 times a year, other than that she would only agree to see DH during the day or we'd stay with my in laws, or she'd demand a vacation/hotel/resort stay. If she did stay at our house she'd just use her room to keep her bag and change in the bathroom and sleep in the living room (with my SIL who always wants to tag along) so she could watch TV all night. My MIL and FIL usually took The SD/Guest room when they visited at the same time as SD.
This was the time SD agreed to see DH less and less, around when we got married but before we had kids. At this point she barely talks to him between seeing her every other month or so.
I have my first baby and she gets the other bedroom. Then I have my 2nd and my husband wants them to share to leave the SD/guest room available. I refuse because it's just easier for me as a parent to keep them separate. The rooms aren't huge. I didn't say it was because SD hardly stays over and doesn't need two full rooms while our kids have to share. Plus any other family guests we have are nothing but drama so I'd prefer if they get a hotel. We still have 3 couches if they need to stay.
After the 2nd baby got the guest room SD didn't care. But boy everyone else did. For a long time now I haven't heard much about it. But after an outing with the in laws suddenly the topic is back. Hmmm. Methinks MIL and SIL complained that they and SD don't get stay over anymore. Suddenly DH is trying to convince me to move our kids together and giving me all these BS reasons like they can stay up talking, they will like it, it will be easier for me, etc...
But I think the real reason is long ago DH said he wants SD15 to live with us while she goes to college so he wants to move our kids into the same room and open the guest room back up. I told him if he wants to do that he can make it happen. I know he won't but he's been pouting and continues to try to convince me with these lame reasons.
We have a huge unfinished attic that if finished could be an awesome masture suite and I told him he could do that if he wants to open up our room as a guest room. I know he isn't going to do that either.