If the family spent the entire time talking about other family members or events only relevant to the family, and refused to provide context or explanation when asked, then it doesn't sound like you're the one with the problem TC.
I think it would have been more helpful if you spent time engaging in more 1 on 1 conversations with people so you can figure out some shared interests or hobbies and try using that build off of. It seems like the family as a whole just wasn't that welcoming though.