Seduce Cal
With care, due regard and gentleness. Come to think of it that is about right for any lady.
To convince your aunt that you love her, you can:Bake some cookies.Make a card.Pick some flowers and give them to her.Hug her!Compliment her.These methods should work.
She won't. Telling her will probably not convince her either.
If your aunt is not your legal guardian, then there is no point trying to convince her; there is no way she can do anything to help you. You need to convince your parents. If she is your legal guardian, then simply convince her there is nothing wrong with such a tattoo, including explaining any symbolism in your plan for it and why you want it so much. Your last option is to wait until you are of legal age to get it done without anyone else's permission, which from the sound of it could be a few years yet.
If your ankle is swollen slightly then you should not have to convince your father that you have sprained your ankle. Put hot and cold cloths on it to bring the swelling down and a tensor bandage (not too tight) that you can buy at the drug store. Meanwhile talk to your mother or an aunt to have the ankle looked at in case you have a hairline fracture.
Aunt's
Tom Sawyer's aunt was Aunt Polly.
Great aunt.
Your great aunt.
Aunt
Capitalize "Aunt" when it is used as a proper noun directly before the person's name, such as "Aunt Jane," "Aunt Mary," or "Aunt Sarah." However, if the word "aunt" is used informally or generically, it is not capitalized, such as "my aunt" or "she is an aunt."