Mil is generally well intentioned but does drop some clangers. We have 2 girls age 5 and 6 month baby. She said to one I love you, you're my favourite granddaughter. I thought that was very damaging but maybe only if it comes from parents. Dc1 was sat there looking very pleased with herself. It's the 2nd time mil said this. I'm now really worried DC1 will use this against baby when they're older, feel superior or constantly on edge about whether she's interesting enough to remain the favourite.
Yanbu - it's ridiculous to tell one kid they're a favourite
Yabu - sure it's slightly off but no biggie.
How can we say to dc1 this isn't a thing?