Because bad things will happen when my brother lives upstairs, the older generation is very taboo about this kind of thing.
As a great young man of 2 1 century, you don't have to avoid these superstitious things at all. As long as you feel comfortable, you can live as you want. Don't care about this statement at all.
If you are too old to live, you may consider it, because it is inconvenient for you to go upstairs when you are old.