So I didn’t change my name when we got married a few years ago - which the in-laws definitely know and have never said anything bad about (that I know about). MIL is also on Facebook so would be reminded every time I post photos of the kids of my actual name. However, every time she posts something to us (they don’t live close by) it’s addressed to Mr and Mrs XYZ. Wondering if I should just let it go, it does bug me because I don’t know if she’s doing it deliberately or just because she’s old fashioned.