Girls;
Parents can be so stubborn. Sometimes it isn't a matter of not supporting your decision, it is that they are afraid. They can be afraid that they did something wrong, causing you to be like this. They cannot accept the loss of their son this way, and hold out hope, you'll outgrow this and come to your senses.
Which as we TS gals know, never happens once we are in tune with our core identity.
Parents can feel a great disappointment, and sadness, that their son isn't turning out to be who they thought, or wanted.
They may feel let down by you, and will place heavy blame on you for revealing this to them. A matter of TMI...
Parents who are limited by their own education and background, will also not quite step up to the plate...
They could be ashamed and afraid of what the family will say...
Some of them will turn their shock and disappointment into anger, and then decide to punish you. i.e. disowning you, throwing you out of the house, refusal to accept it. etc.
Your best chance to disarm them, and force them to deal with this real issue, is information. Rent videos about transsexuals, and what they go through. Send for information from gender clinics, or visit them in person. Start off gentle, instead of dumping the whole load on them at once. Have one or both parents accompany you to a clinic, and talk to a SSW about it. Do not try to embarrass them into accepting your new found identity. Go easy. Let them also grow accustomed to your new needs and desires.
Never demand it. Also, NEVER NEVER EVER show them ->-bleeped-<- porno. Those gals, do not help anything at all.
Instead, gather information off the net, about real life TS's and their successful transitions. It is out there to be found.
Be your own best advocate, being loaded with facts by doing the research first. Blog sites such as this one, may not necessarily be the best thing to use as your base of information...
Lastly, unfortunately, if your Dad is named something like Billy Bub, and nicknamed by his buddies;" snake "... and he and they like to get plastered on hooch, chase women and love their hunting dogs, and truck more than their wives of live in girl friends... and sport Harley Davidson and flaming Skull tattoo's, You might have a problem convincing them that this is what you want...jus' saying.