OP, I am someone who is somewhat in your friend's shoes. My DS (15) is SN. My nephew (14) is an extremely high achiever and all-around fantastically "successful" kid who has a briliant future.
My sister and I are very close. I can tell she is sensitive to the disparity between our two sons. Several years ago, when my nephew's giftedness became obvious, I could tell my sister felt uncomfortable sharing his accomplishments with me.
Finally I sat her down and told her, "Look... we both love our sons. But yes, they are VERY different. And you know what? I am fiercely proud of [nephew]. He is going to BE something some day and I will brag to everyone -- 'That's MY nephew and I knew him when...'.
I ENJOY the fact that he is so bright and has such a promising future, and I look forward to watching him grow and succeed. PLEASE never hold back bragging about him to me. I am proud of my son, too, and equally treasure HIS accomplishments and love how you share in my delight when I tell you his latest triumphs.
So just knock off being hesitant and awkward or I'm going to smack you upside the head -- OK?"
She still has her moments, but at those times I just threaten to smack her and she gets back with the program.
