Please tell me he has a dragon named Delta because like...that movie broke my heart. But yes, it's doubtful either know Charlie and even if they did they'd just be like "ah another Weasley."
ANYWAY as for Remus, you're probably right on that front. Mafalda didn't care for the Marauders, though she never advertised her bigotry on a widescale or anything. She probably maintained (and still maintains) a healthy distance from them to this day.
Oh Pansy. Elladora is fairly territorial when it comes to Evan, but in a weird way. So if they ever interact with each other and if Elladora catches wind of Pansy's intentions, she may do things just to undermine/spite her because that's how she do.