Strangely, our family (extended) was a war zone when I was a kid, but now, those of us that are left and our spouses, parents, children, are all mostly on the same page. It's a blessing! My grandmother had cold-quit Rome in the 60s and never looked back; waited for ABL it seems. By the time I came along, she was SSPX, and everyone was at odds and warring. But now, everyone is NOT at odds at all. We're all on the same page. I credit grandma and hope she is seeing this day. It's very heartening.
In that sense, I think division can be good. Be frank, not naggy but frank, and even if people don't hear you immediately, they may have something to fall back on in the future.