I, luckily have two sisters!
One is 7 years older than me, and we do not get along at all!! We are sisters and that is the extant of it, nothing more. Like you her children do no wrong.
And anything that happens is always my kids fault!
The funny thing is when my sister is not around, all the kids get along great, that would be my sisters four children, my brothers two children, and my four children. There is no fighting, when she is not around, but, if my sister is there, there is tattling, fighting yelling, screaming, you name it, it happens.
My sister even picked a fight with my oldest DD at my Grandmother's funeral! And she is constantly asking my daughter personal questions, that are none of her business, I mean questions that even my sister that I am close too would not ask my DD, and my close sister was even right there by my side when I gave birth to my oldest DD!!
On the other hand, I have a sister that is only two years older than I am! We are very close! The only thing is she does not have children. But, we still actually do things together, we go shopping, just visit at each others homes (mostly mine, so that my kids can do their thing, and not get bored). I could not live without this sister!!!
It is almost like my oldest sister was raised by a different family!! I always hoped that as we got older we would become closer. It just isn't happening.
We are too different, so we are always decent to each other, and that is that, we never get together, except at family functions, and to ocassionally we are together at our bi-weekly visit to Grandma's.
Sometimes, I wonder if my sister is just jealous, that I have had a closer relationship with our Mom, as our Mom quit working to take care of oldest sisters son, when I was only ten, and my Mom and I got to do things together when I was in my teens, and I feel that that really helped me.
And than there is the husband situation, which is when she really started being ignorant to me. As my DH and her DH are both in the same field of work. And my DH is nine years younger than her DH. And that seemed to cause alot of friction there!
I won't even get into my oldest brother and sister and my parent situation, here that is a whole other thread!!!
Good luck!!!