My moms brother was gay. I grew up knowing he was gay. It was never a secret to me, he and I had a grea relationship, and it never impacted me negatively to know I had a gay uncle growing up. If anything, it thwarted ignorance. I vote for letting them know who their uncle truly is. I'm sure if you don't they will organically find out over time, but why not let your brother in law have that special
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