Not in my house with my children, but when the grandparents visit, we all wear masks indoors now. Too cold to stay outside, but with three different educational establishments involved, we all just feel a bit more secure. We could obviously not see them but it seems a shame to do that and they are happy with the risk and I'd much prefer to see them with a mask.
If I knew I had corona, I would consider wearing a mask in my own household. I'm always keen to keep people apart when they are sick, if the kids get a cold, they usually rest, get food brought to them, use separate towel etc. I'm not one of these if one gets it, we all get it, people, and I've rarely had spread of things like stomach bugs in our house, if one gets it, the rest of us often don't.
In the student households not everyone in close quarters with the corona positive person gets it, we don't know why- could be no transmission or they are immune, wouldn't hurt to try to prevent the spread.