Dear Future Sister-in-law,
First of all, I want to say thank you. Thank you for obviously being one of the main reasons my brother is smiling so much. All I truly want for him is for him to be happy and successful. It feels completely unreal to think about the day I will be sitting at his wedding, celebrating your love and you becoming a part of our family. I know my brother and while it may sound cliche, he honestly deserves the best. He has watched me go through more heartache, with probably many more to come than anything and would never hurt a girl in any way. Many girls don't understand the hurt that their brothers have caused for some girls and I am proud to say that my brother is definitely not the person to do that. While you already may know these things, I want to reinforce the most important things of marrying my brother...
Welcome to our crazy family. Family is the most important part of my brother's life and I am certain he picked you because you both have that in common. Welcome to our family birthday celebrations, annual Christmas Eve party and very fun weddings. I really pray that you love this family as much as my brother does.
Please spend your money wisely. Ever since my brother got a debit card, I have heard countless complaints from my parents of him spending his money on pointless things. You better be a saver, or else your money probably has no chance.
Know that your future children will probably be the luckiest children in the world because my brother is the most caring person to children. If he was in my field, he would most likely have been a pediatric nurse. Also know that your children will be lucky because they will have the most caring aunt to help guide them along with the most caring grandparents. While right now, we aren't rushing that day, we still all can't wait to take part in those special moments with him and you.
Even though we may not have crossed paths yet, I know I will love you already. I cannot wait to meet you and call you my sister.
See you soon,
Your Favorite Sister-in-law