Listen without rushing to fix things, ask what would help, and offer one...

https://blast-wiki.win/index.php/What_Should_I_Say_When_My_Brother_Keeps_Skipping_Family_Gatherings%3F

Listen without rushing to fix things, ask what would help, and offer one practical step, like sitting together while they call for an appointment. You can care and still set limits. Support may take more than one conversation, so check in again.