My sister and I used to be close. We fell out for a year or so over 20 years ago (because she was cheating on her partner, I found out and called her out on it, she didn't like it) but I thought we had sorted all that out. She can hold a grudge whereas if I have something to say, I have to say it. If I ask her if I have done something wrong she always denies there are any issues.
We both have children - my niece and nephew are a few years older than my DC. Before I had my DC I would babysit for her weekly, we went on holidays together and were generally really close. Things have gradually changed since I had my DC and now I barely see her. She has been to my house about 10 times in 10 years. She never invites me to hers but always says yes if I suggest visiting her. I have zero relationship with my niece and nephew, really, which makes me so sad as we were so close when they were small. I message them sometimes if I have something to say/ silly meme or something to send them and I get a few words back. I always send presents/ cards/ money for birthdays - my kids might get something via my mother two months after their birthday.
We have a group of mutual friends - more her friends, I guess - my sister and two others were all in the same class at school and our parents became friends, then the siblings (ie me and two others) became friends too. We have all known each other for 35 years. My sister meets up with the two of her age regularly (the three of them are very close) and otherwise we meet up the 6 of us every couple of months.
I do a yoga class with one of them (a sibling) every week - I hear more about my sister's life from her than I do directly from my sister. It is embarrassing (ie I had no clue she was going away for half term but this friend knew all the details and was invited along too).
I don't know what I have done wrong. I feel sad I hardly know my niece and nephew and that my kids don't know their aunt/ uncle/ cousins. I try to organise get togethers but it never happens - she is always too busy but never suggests another date.
It has now started that when the 6 siblings go out she won't go if I am going. Before Christmas we had tickets to a show booked months in advance, my sister could no longer make it so someone else bought her ticket. On the day, I had flu so cancelled - suddenly she could go and took my ticket - the other 4 were overjoyed. My sister is definitely more outgoing/ fun to be around than me but I am not a horrible person, just quieter.
We had a date in the diary for tomorrow - usually we go out for dinner/ round someone's house. I made some suggestions in the group chat earlier in the week and offered to host but got absolutely no response. I guess I am being phased out there too.
I basically only see or speak to her if my mum is involved now (I haven't seen her since last November - Christmas got cancelled as my mum wasn't well). When I did last see her I thought we got on ok? I get one word answers or a thumbs up if I message her directly but she is perfectly normal with me on the group chat with our mum.
For more context, my sister lives 45mins away but I still live near where we grew up, our parents and 3 of the other friends. My sister will come up to visit them but never suggests stopping by for a cup of tea. She has no interest in my DC and even had to message to ask how old my youngest was when buying a Christmas present.
I have asked whether I have done something to upset her before but she always just says no. She is always "busy" but always has time for her friends and husband's family. She doesn't work and her kids are now 16 & 18.
I feel she does the things she "has" to do for show - Christmas and birthdays but really doesn't want to. I suspect once our mum has gone I will never hear from her again.
I don't know why I am posting really, just feeling sad about it all.