Maybe her marriage isn't going well. She sees what a good marriage you have, and it's adding coal into her fire.

I agree, a sister should not feel jealousy, but they do. It's the rival thing they grow up with. I donÄt have a sister, but my mother does. They seem to have a simliar problem, and my mom is 85 and her sister is 80.. Isn't that ridiculous?

Just try to think "Onward", Dianne.