Thats so cool! I'm the same as you, I have a completely unhorsie family besides myself. Sometimes I find it frustrating when you want to tell them something fantastic you did (horse wise), but know that its pretty much wasted on them.. especially since I always know that I have to start from the beginning with anything I tell them, and even then it goes straight over their head!
I'm very glad your brother wants to ride! My dad refuses to take lessons or do any of my 'dressage crapola', mums scared to death of horses and it hasnt even crossed my brothers mind to try- and it never will!
It's a great accomplishment!