One really interesting thing (at least to me) about this Christmas: my mom kinda adopted her bridge partner who has little family around. The partner, probably in her 80s, was invited to spend Christmas with us.
My first thought was, "INTERLOPER!" Then as I got to know the woman, I really liked her. As things progressed, the whole affair came to remind me of any Christmas with my mom's mom, Sweet (that is what her grandkids called her). It was great.
To be so reminded of Sweet was melancholy, but nice.
The "interloper" even broke out her violin and performed Christmas Carol duets with my mom (on the piano). It sounds corny, I know, but it was great.