Despite the urge, remember the following are all none of your business to ask about:
Their size, weight, or any other body changes
When they’re going to get a partner
When they’re getting married
When they’re having a baby
Why they’re not drinking
Unless they’ve opened up to you about it first.
@mattgrayyes I know a bunch of people who are in AA and all of them have one big problem with holiday festivities and parties in general: what to say when people ask them why they don't drink, and how to refuse when people insist on giving them alcohol anyway. It's made some of them skip parties altogether, because they knew how much of a struggle they'd have. Having non-alcoholic options as a default and not questioning the choice someone makes are indeed paramount.