Hi S&G,
Well, to "challenge" things said about you, you probably have enough material to review for common themes. So you can arm yourself with stock phrases to repeat like a broken record. The good thing is you can come up with something true about yourself without hitting them with a sledgehammer.
For example, "you never visit us".
You reply "We so enjoyed our last visit in Sept."
"Why don't you let her speak for herself?"
"Darling, have I said anything you disagree with?" OR
"Of course, I just thought it was my turn. You don't mind letting everyone join the conversation, do you?"
all said with a smile. There's always the standard "I'm sorry you feel that way. I remember it differently (of course)."
When being coerced into some group thing or being asked indirectly to do something "Good luck with that!"
If it's awkward because there are "outside witnesses" that are hearing all this and you are trying to be polite, you can say, "Wilbur and I often recall things a bit differently." or "if two people always agree, only one is doing the thinking!" or "everyone is entitled to their opinion" or "oh, if you're going to bring that old shoe up again, Wilbur, let's make sure our friends have all the facts..." whatever the occasion requires. If you are feeling a little pissy, you can quote Gertrude Stein "tell the truth, it's easier."
On and on. You can prepare yourself with calm & mature one liners at the ready. My mistake was in not thinking ahead and trying to keep peace at a huge cost to myself.
A couple of books that are helpful are The Art of Verbal Self-Defense by Patricia Evans and Stop Walking on Eggshells (I forget the author).
Hoppy: I think the lack of parent caregiving from Ns is just one more aspect of Me, me, me. And me. Double standards reign supreme in my father's house. I get to, you don't. You have to, I don't. etc.
Hugs, MP
PS Just read mudpup's reply and he's right. Sadly, I've had this happen to me...so here you go. A few arrows for your quiver.