Re: unannounced visits
There is a hadith to knock on someone’s door three times when you go their house and if they don’t answer come away and do not feel bad about it “b"ura mut mano”.
I would never do such a thing either whether people are working or not and whether they have kids or not. A long time ago, my husband’s friend’s family used to drop in at odd hours. I had a small baby and they didn’t at that time. So I put my foot down one day when she called to say she was coming and said sorry, I am going to bed.