My sister just got married on the 16th.
It's been an interesting trip for me. My sister and I used to be really close, partly due to the fact that we were support for each other during the last 10 years of my parents' incessant fighting. We usually got along really well, gave each other advice, had fun together. However, once she got engaged, she changed - or, perhaps, I noticed her behavior more.
She appeared to become much more selfish, and more vicious in her reactions towards some of our family (I'm not going into details, there are some limits to online postings); enough to make me realize that I can't trust her as I once did. This does not mean I don't care for her greatly, but that I am starting to increase my emotional disconnect from her. She is creating her own familial life now, and I respect the fact that she is also creating her own disconnect from her family.
Our relationship has changed, greatly - I don't trust her as much as I once did, but I also respect her as an adult more - her capacity to make her own choices and bear the consequences. Our friendship has suffered, but that happens. She married a great guy, I like him, and I am happy for her. I wish her the best in the future.
(note: this sadness only really happens in my family, I think. It takes a deeper understanding of my family and their history to fully understand the post itself)