Hi Soph,
In terms of family, I am in exactly the same situation. Daughter who is 7 years old and my wife wants me to wait 11 years for her to turn 18.
Talked with her today about it and told her that I am likely going to transition and because we lack money, it will be on the NHS timetable, so 2 years to see psychiatrist, hopefully start hormones after that. Live in role in about 3 years time. Transition in 5 years... IF, everything goes according to typical time scale. It may be quicker or slower.
Lots of tears, anger, etc. But she is starting to accept this is likely to happen. But has no idea how she will deal with it, so we are just going to play it out and see what happens. Acceptance that it is likely to happen is the main thing I wanted her to understand today. We can start working out the details as we go on.
If you want to talk about it any time then feel free to pm me.
love
Alice