tread lightly is my advice.
who in family has power of atty?
While "doing favors" and "remember Moms intent" goes far................be prepared for disruption in the family no matter how amiable people are now.
Pick your battles wisely, and let the little stuff go, but stand by your gut feel, most often it's right.
Yes I went through this last spring with a dead grandpa and his bickering sons over intent of the will and trusts.
It's hard, but do try to let the little stuff go, it's not worth it in the long run. Did I mention it's damnnn hard to not make it personal between family?