Hi Grace,
I can't believe your dad's email.........and I do not know how you managed to be so calm, clear and factual in your response.
You have very clearly shown where the "problems" lie - not with you! Your dad appears to be very good at turning this into something that's "all about him". It is your life, however, and it is crystal clear you want normal friendly "family-like" contact with your family.......how can you be trying to cut yourself off when you actually are the one who wants to see them?
Clearly the time for "playing nicely" is over, and you have made your position really well.
What do they not get about having a happy daughter and not a miserable "son"?
I wish you all the luck, and all the love, to get through this.
Take care of yourself, first and foremost,
Ros