Firstly, I'll set the scene. We're identical twin sisters, who are old enough to know better! We were extremely close all through school, only making separate friends when I went to college and she went onto a YTS scheme.
We ended up working across the road from each other and would spend most lunchtimes together, as well as speaking 2-3 times a day on the phone 
I was her birthing partner in 1995 
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I moved away from the area in 1998, met my OH, married and had children.
I visit my folks maybe twice a year and it was during one of these visits that our relationship floundered.
My daughter, who was 2 ish at the time, was playing with her daughter who is 2 weeks older. As kids of that age do, my daughter wanted whatever they were playing with to herself ... just to say, she was an only child at this point, her cousin had a sister .... when my sister chirruped up "I teach my children to share" and snatched what my girl had to give to hers. Anyway, we decided to make a swift exit at this point to check into our hotel. I didn't see my sister again during that visit.
2 weeks later, it was my eldest niece's birthday and knowing my sister was still festering, I sent money to my eldest sister to give to my niece, knowing my twin wouldn't bank a cheque if I sent it to her.
I received this money back with a note, telling me never to contact her family ever again and as far as she was concerned, I am no longer her sister!!
This actually caused a rift between myself and my parents' as they sided with her and we didn't have any contact for over a year. The only reason they made a move was because my elder sister told them I was pregnant again and they didn't want to miss out on grandchild.
During this time, my mother and father have had their Ruby Wedding, my Mum turned 60, my Dad turned 70. These have variously resulted in a family portrait of all the grand children, family meals and get together's, al excluding me and my family.
My parents' and sister have asked that we make up, folks not getting any younger etc. and how awful it would be if the rift hadn't been mended before one of them passed on .....
I have told them all of the letter that my sister sent, as she obviously didn't, but haven't shown them, I'm not even sure if I still have it. My father said it put it into a different perspective. Whether they have badgered my sister into making up, I don't know.
So, maybe the time has come to bury the hatchet ... but not in my sister's head 
... but how?
Or should I? She has always been self righteous and in her eyes superior to me and if I'm honest, I don't miss that part of our relationship.
I don't really expect to get an answer here but I can't speak to my family as they're all too close and I know whatever is said will get back to her.
My Mother still tells me what is going on in her life, even though I never ask after her. We both have children that neither has met and I know my kids would like to know their cousins.
Right, that was a proper ramble 
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So, any bright ideas?