Advice/opinions please read!

So I’ve had three miscarriages and found I have a genetic mutation, MTHFR. It is associated with recurrent pregnancy loss. Luckily I got supplemented & am 15 weeks with my rainbow. My question is whether I should ask my sibling(s) to be tested. My brother is getting married next week & I know they plan to TTC ASAP! There’s a good chance he has it as well & I’ve read it can also affect male fertility. I’d hate to see them have a hard time especially if supplements/vitamins can prevent anything but I realize it’s not really my place or business to talk to him about it. I thought about saying something after the wedding but I’m pretty sure my sister in law wants a honeymoon baby lol

What do you ladies think? Thanks