Hi,
I just found a lovely poem for a thank you card if you're having your SIL to be as one of your bridesmaids so thought I'd share!
"The day that I marry, our families will blend,
you'll be my sister and also my friend.
It's so special to know that you'll be
a part of our day as bridesmaid for me
right at the beginning of our new life
as your brother and I become husband and wife"
