The one with kids has visitors so probably them. Old people can get pretty lonely if they don't have descendants. It's not talked about often but it's a really important part of not being miserable when you're 90.

When your body isn't good for anything anymore and you can't even enjoy spending money, being happy about the people you created is more or less the only thing left - and you can really be happy about it. But that's only if you have a good sense of empathy for the happiness of people you care about.