People in your HH seeing their SO?

Why not?? She's an adult...let her move.

Decide he’s going to be part of your bubble or encourage her to move. It’s unreasonable to expect adults to conduct their relationship in a driveway for 9 months.

ETA: Given the additional detail you shared about his living situation, obviously including him in your “bubble” is foolhardy. I personally would not want my child’s partner living with me, but I’d help them get their own apartment, if they wanted to. Or she could move into the frat house and you could see each other in properly socially distanced, masked ways.

She wants to be the 8th person to move into a house with one bathroom?

Can he move in with you?

You asked what others are doing.....ds19 has been seeing his GF since the initial lockdown was lifted. She’s an hour away at college and had a couple of roommates (each in their own bedrooms, I think they share a bathroom with only 1 other person). She’s reasonably cautious, not a partier but does have a very small group that hangs out sometimes. She did get quarantined as a close contact at one point, and of course he didn’t see her during that time. But in general they see each other most weekends. But we’re pretty low risk and generally stay in. It’s a balance that works for us.

We have let my 18 year old's boyfriend be part of our bubble. She is our only child living at home. He has no siblings living at his home and his parents have jobs with minimal contact with others. They are both doing distance learning at school. I know his family had a Thanksgiving with just the three of them. I know they are concerned about his grandparents and are trying to be careful. His parents know that we are Covid careful and they'd feel bad if we didn't let our daughter see their son. I know they try. Honestly, I do feel some concern about it. My husband and I try to keep several feet away from our daughter which is pretty easy to do. We don't ride in a car with her.

We have decided that the risk of allowing him into our bubble is offset by the happiness he brings into the bubble. We like him too and enjoy seeing someone regularly.

eta - I recognize that our bubble is not as small as we think it is because we've allowed him in it and her into theirs. 

The gf and my ds hang out all the time. The gf even comes to my house on occasion. In fact she was here just before her mom tested positive...

But we can't isolate here. I teach, have a hs age son, and a dh who works in health care. There is no reason for ds and gf not to see each other

Yes my kids (age 18 and 19) have been seeing their SOs regularly.

The way I see it, you have one of 2 choices. Let BF be part of your bubble and allow him in your home. Or have her move in with BF and roommates.

Neither option is perfect. Think about which sounds the safest and go with that. My choice would be have BF in your bubble. You have to do your best, it may not be black and white.

My older teen son spends time with his girlfriend, in her home or ours. He doesn’t hang out with other friends. He also doesn’t attend school in person.

I’m okay with it. Her older brother is already in our bubble, because he is my oldest daughter’s partner. (Did you follow that? My two oldest kids are dating a brother and sister, so the two families are already co-mingled.)

Yeah that. At 23 I was married with my first child and owned my own home.

Dd#1 is 21 and has been with her boyfriend since they were 16 ... she lives with my ex and the boyfriend pretty much lives there too (unofficially) ... it works for everyone    

Yes our 18 yo son sees his 18 yo gf on a regular basis.  I do stress because she lives in a house where her stepdad has kids from another marriage who come over, so there is mixing going on.  I do know most and all are concerned with staying as safe as possible.  He didn't see her for the first 2.5 months of the pandemic and I don't want to do that again.