I love your Mom's chair Kerry. And no it doesn't make you sound psycho or spooky. That chair has a lot of sentimental value to you. It's a beautiful chair. Do you ever sit in it? Mom always sat in a certain place on the sofa, over on the far left and she'd always set her coffee or tea on the side table next to it. I remember somebody sitting down in that spot on the sofa just after she died and I felt very angry about it at first. I didn't say anything, but it almost felt like that space of hers had been violated. So I could easily understand if nobody sat in your Mom's chair. 
I love your Grandma's plate too. It's beautifully painted. The picture on the plate would get my imagination working too. And there's a tremendous amount of detail. It's beautiful!
Though it's only an old armchair, with no intrinsic value whatsoever, it's priceless to me. I very rarely sit in it, David. Occasionally, but not often. And it's located in such a position in the room that no-one else ever sits in it either. Like you, I'm sure I'd be none too pleased to have someone else sit in my Mama's chair.
Some time after Mum passed away, I found one of the other plates that had belonged to my grandmother. I found it in a store near my place of work. Not the actual plate itself, but an exact doppelganger. It was the same as the plate my brother, who lives in Perth Western Australia, had taken. Now there's only one more plate to get, to complete the reunion. On the back of this plate it has a crown and a scroll, with "Mason's" above the crown and "Ironstone made in England" inside the scroll. Under the scroll it has "Mandalay" as well as two sets of hand written initials.