Hey Tarfish... welcome to Susan's.
Echoing... Having family support is massive, as your family is your grounding.
It does take some time to process what Gender ID is about, they will need some time, lots of understanding and sharing of you thoughts, and there's. This is possibly why they are continuously questioning... remember its all worlds that get turned upside down...
With fathers, daughters are their favourites, whereas with moms its boys... well at least up till marriage or young adulthood... give them time... but keep talking.
Have you been to a therapist yet? maybe worth doing also when its right maybe invite your parents along?
Unfortunately some people will never understand, but, does your friend know yet?
Anyway Welcome and look forward to seeing you about the forum's
L Katy