I have always considered me and my sister to be close. We are only 2yrs apart in age and when we were younger (teenagers) I didn't have many friends (I was a geek!) and she welcomed me into her circle.
I became good friends with "her" friends - we have been on holidays, to each other's weddings etc. I see some of them outside the group dynamic, others not so much. We are in our 40's now.
However, over the past 3 or 4 years I have felt that my sister is trying to exclude me. She now does things with her 2 best friends and never, ever includes me. Tbh I have my own friends and life now and so I am happy to stand back if that's what she wants. It hurts that these people I considered friends do not appear bothered not to see me but I have always been someone on the outside of the group anyway. If I try to arrange to see everyone it never happens, my sister will always say she can't make it and because I suppose she is the linchpin no one else will then come. It is weird as it was never a problem before.
She also never arranges to see me or my DC (our DC are similar ages and get on well) but she always sees her in laws and the cousins on that side plus he friends. If I didn't go to see her or invite myself over I would never see her. She only messages me when she wants something (usually to piggyback on a present for someone). In the past two years she has been to my house twice (I know, Covid, but I try to see her once a month and drive to hers 30 miles away). It's like if I didn't try she wouldn't bother with me at all.
When we get together we get on well. I don't understand it.
The thing that has upset me today is that last Christmas I organised for our two families to go to a winter lights thing. We had a great time together and my DC badgered me to go again this year. She was evasive about going and wouldn't commit to a date (in fairness the tickets came out 3 months ago and who knew in August what they would be doing in November!) so it was never booked. I know I should have just booked for myself, kicking myself now.
Today she let slip in a group chat with my mum that she is going next weekend with her two best friends and their families. She must have known back in August that this was planned because the tickets sold out quickly. It hurts that me and my DC are being pushed away and she always puts her friends and in laws first.
I have never said anything to her about this. Should I say something? I feel like, if I have done something wrong I would rather know and also, am I just making an idiot of myself? Flogging a dead horse?