How do I come out to my grandparents?

[tardy blade]

Okay, so I'm trans masc, gay, and ace, and my grandparents think I'm a girl, and I'm straight. I also have to mention that they do not like gay people at all :/
So, how do I approach this without them hating me after????

[lilac vale]

let them spend the rest of their lifes happy, they dont deserv all shit u gonna make them through

[bronze parrot]

As a trans guy, don’t. It’s best for the both of you.