On email, hell no.
Via mail, maybe.
By text, hell no.
By proxy, yes yes.
This message has been brought to you AFN Europe.

satire aside
If you love yourself, don't make a traceable record of transition, for bigots will use it against us.
If you can hire someone to deliver the message for you, that's better even if they respond poorly. If you feel it's an obligation, I can respect your decision to inform them. But do not do so insecurely. The obligation is between you and them, not you and bigots. If have a friend than can deliver your message for you, then take that route, that way you don't have to deal with anxiety you're expressing over your parents’ misinformation.
—With much love and care, Ala😊