In DH’s families, very little - people table any disagreement for another time. Mostly good, although it means that often only unimportant subjects can be discussed. Religion and politics, for example, are taboo. This quote comes to mind: “A man’s opinion on tram cars matters; his opinion on Botticelli matters; his opinion on all things does not matter. He may turn over and explore a million objects, but he must not find that strange object, the universe; for if he does he will have a religion, and be lost. Everything matters — except everything.” G. K. Chesterton At the same time, the food is usually great and the get-togethers are definitely relaxing and pleasant - so I won’t say that there is anything wrong with avoiding difficult topics at a family get-together. I just feel a bit like I never really get to know these people.
In my family, arguments happen quite a bit - ranging from reasonable, polite, albeit spirited and often frank discussions (politics, religion, philosophy, history, science fiction (hey, my family has a lot of geeks!), etc.) which I think are great for my kids to be exposed to, to out-and-out dramas that leave Hollywood unable to shock me. We’re talking police calls on other family members; people being blamed for family member’s deaths, murders, or abuse; epithets; victims being asked to apologize to their abusers in front of everyone

; people being kicked out of wedding receptions (for bringing specifically un-invited people who abused other family members); the works. However, I haven’t had a holiday like that in almost 10 years . . . for a couple of years in my early teens, that was the norm.
For the most part, the rational family members have disengaged from the irrational family members and the drama has mostly died down in favor of the previously mentioned lively discussions. I do really like spirited arguments that happen in a shared delight for intellectual debate, with respect and a sense of comraderie towards one’s “opponent”. I learn a TON from these impromtu debates, and everyone of any age is welcome to join in - usually kids start participating around the mid-teens. Getting the “good” arguments without the “bad” arguments is really a joy, and something I treasure. Too bad the bad arguments split up the family so much that we hardly get together any more to have the good arguments

I remember when those get-togethers weren’t limited to holidays, but happened at least once a month or more. Us little kids would quietly play out of sight waayyy past our bedtimes, hoping no one remembered to put us to bed, while the older kids and adults debated and talked loudly late into the night. Ah nostalgia . . . only happens a couple of times a year now. And now I’m one of the debating adults

and it’s my kids playing quietly upstairs with their cousins and trying to avoid being noticed!