My brother-in-law (my sister's husband) has recently (in the last nine months) stopped all contact with his narcissistic mother (Mary).
She is deeply resentful of my sister for taking her only child and has tried to ruin their relationship with lies, passive-agressive behaviour and pathetic competitive game-playing. My brother-in-law has finally decided he's had enough of her and the way she treats my sister and wants no further contact with her.
Mary won't accept that her son has made this decision and is constantly trying to re-establish contact. She recently found out my sister is pregnant, despite my sister and brother-in-law deliberately not telling her and is reinforcing her efforts to make her son speak to her.
She is apparently going round their family and friends trying to get sympathy and blaming my sister for the estrangement.
The only time I have met Mary in person was at my sister's wedding two years ago. I found her quite an overwhelming person who tries to make everything about herself. However, I enjoyed her company on the day and we got on reasonably well without me feeling we would ever be good friends.
Until now, the only other contact I have had with Mary was an exchange of Christmas cards last year.
Two days ago I received a delivery of a large, expensive hamper from a local farmshop and a message to "My dear friend WaitingforthethingtoHappen, wishing you a wonderful and happy Christmas" and "looking forward to seeing you in the New Year. Love and best wishes from Mary".
I have spoken to my sister who would prefer that I have no contact with Mary at all. She and her husband believe (and I agree) that Mary's gift to me is an attempt to establish contact with me and through me, them. They think I shouldn't acknowledge the gift in any way, that I shouldn't thank Mary for it, nor should I return it.
They have suggested I send it to the food bank if I'm uncomfortable keeping it.
While I understand and respect their reasons, I would feel uncomfortable for not thanking Mary for the gift and a part of me feels I should send a small gift in return.
Am I being unreasonable?
You are being unreasonable - the gift is a form of toxic manipulation, not a kind gesture. You should support your sister and brother-in-law's decision and not acknowledge receipt of the gift in any way.
You are not being unreasonable - it would be rude not to acknowledge such a generous gift and should at least thank Mary for it and consider sending a gift in return.