I always prefer the more subtle parent issues (and mother-son, father-daughter, and even father-son, over mother-daughter), where it's all a case of parent-wasn't-there in some way (and later regrets that, or not), or of the kid's expectations being impossible to fulfill (whether or not he notices). Or really, really, unhealthily close relationships. It's interesting that you like the violent disagreement kind! Any reason? Or is it just the major emotion expressed then that gets to you?

Mother-daughter usually fails me not because of the lack of conflict, but because (fictional) women often can't admit even to themselves that there is conflict or distance in a mother-daughter relationship, so the best you get is a one-sided thing or something awfully passive-aggressive, and it never resolves. (Or you end up with stereotypes and flat, two-dimensional villains or angsty 'monsters'.) Passive-aggression in fiction really pisses me off. :D And fictional mothers, too, aren't usually allowed to abandon or not care about their kids without being majorly villainised, unless they die (and are sainted). Motherhood in fiction majorly sucks.

(BTW, your Suwabara icon is the BEST EVER. :D)