OK, well I am relieved to see that most think Person B is being a little off and not Person A, since... well, I am Person A.
I honestly didn't think I had done anything wrong, I was just trying to follow what everyone wanted by doing the Secret Santa bit. And yes, I was given the list so that there was a master copy that everyone could go to in case they forgot. In the past 3 or 4 years several lists were made (just for a regular name drawing) and by the next Christmas I was the only one who still could find the list, so it was decided I would be the one this year to keep it for everyone.
The funny/ironic thing is, there has been tension in the past between myself and Person B about things they lied to me about and have refused to tell the truth on. I have come to accept I will never get the truth, have moved on and it hasn't been mentioned for years.
So it seems weird they are having such a meltdown about being kept in the dark (their words) about a Christmas list, when they have kept me in the dark for years about this lie (again, hasn't been mentioned for years and really doesn't come into play in any way in this situation). This person is all about control and loves to keep people off guard by keeping things from them.
As for talking to other family members, this person would not listen to them even if they tried to defend me. We all know what Person B is like and it does no good to even try and tell them anything... again, it's that control issue. We've all talked, I know they support me and understand what is going on, they don't need to get into a fight with "B" to prove it. I am surprised at how vicious the comments are though.
I'm just confused, because of all things, this just seems so silly. They were to have visited us this weekend, staying overnight and I have heard from others they won't be coming here anymore and won't be talking to me until I apologize. I really am not feeling the need to apologize, and it is looking like this might really be the hill I choose to die on. It's a small hill, but I might just have to defend it this time. I'm sure Person B has no idea I know what they are saying, they probably think they can throw this little temper tantrum and then be all sweet when they need to next time.
I heard the reason they want the list is because they found the perfect gift for a couple of people and want to tell the ones who have those names what to get for them. It doesn't really seem like a good reason for such a fit, but who knows.
I love the idea of framing the list and giving it to Person B for Christmas, but at this rate I'm not sure there is going to be a family Christmas with both of us involved. Time will tell.
Thanks for the input! I knew I could get some honest opinions here and if the majority thought I was in the wrong I would have re-considered my thoughts to climb this hill.