rascal
n
1 dishonest person 不诚实的人; 流氓; 无赖.
2 (joc 谑) mischievous or cheeky person who likes playing tricks, esp a child 喜欢恶作剧的人, 爱捣蛋的家伙(尤指儿童)
Give me my keys back, you little rascal! 把钥匙还给我, 你这个小淘气!
I am sorry that you have a disagreement with your father. Personally, I think it is important to follow your interests and your abilities, and it sounds as though you have plenty of both of these already.