Well, there you have it, Sis. Even though you’re not interested in me or my little family one iota, I wanted to share a part of myself with you that you would not otherwise listen to.
I love your letter, but it seems to club sis over the head on this part. She spoke to you and shared her
life, don't assume the things in this sentence. Here's a suggested change:
Well, there you have it, Sis. Even though these things will possibly seem entirely alien or "worldly" to you,
I wanted to share a part of myself with you that you would not otherwise not know.