Help!! How to tell my parents my boyfriend is transgender (ftm)

Right, my boyfriend and I have been together for a few years now, we are both 18 now and have always known he’s a guy just born with the wrong parts, he’s told his mother today and thank fully she’s always known too! The only thing I’m worried about now is how do I tell my family? I have no idea how they’ll react and he’s been living with us for a year now but Idk how they’re going to react or how to say it???

Btw- don’t comment if you’re just going to be rude, if you have nothing nice or helpful to say then dont say it. Thank you x