People ask why. Some conclude that, as so often in the case of older people with the disease (and as often in the case of older people generally) the person is harking back to their early years, safe and secure at home. They may be. But to me, it seems more general than that.
Everybody seems to have some concept of 'home' that may have similarities to the home they first knew but may not. Even people who have had awful early experiences usually pick up the idea of what home is supposed to be. We all talk of feeling 'at home' in comfortable places and a host will say 'make yourself at home'. And we have sayings like: 'Home if where the heart is.'
It seems quite understandable to me that when someone's world is falling apart, they would like to 'go home'.
The most important point to me is that I can't remember the last time S said this. It must have been a long time ago.