Dear Little Brother,

So many congratulations are in order here.  First, congratulations on your engagement.  You already know how much I like her and how excited I am to have her as a member of our family.  But also, congratulations on getting up the nerve to do it.  I know it wasn't easy.  Especially since this wasn't your everyday proposal.  I know that this is the first step down a long road for the two of you and that it may not be easy.  But I know you can do it.  Best of luck going forward, with her parents, and with life.  I truly wish you both nothing but the best. 

Much love,

Short Stack