Family.

I think you will find that apart from basic biological reality just about everything is a social construct.

Perhaps the best one to use when countering race is 'science.' itself and maybe talk about how color is a social construct. A lack of discrete boundaries for a statistical abstraction such as race doesn't mean it doesn't have predictive power. I also like the idea that in one sense the 'woke rainbow' is a symbol of separate development.

Ed Dutton's new book, Making Sense of Race will doubtless have many more useful ideas