go further yourself. if you understand everything in class, if it's all revision and you are doing well then you can take it further, simply because you have the love of the language. i don't know how fluent you are, or what you use your italian for on a daily basis, but since your dad talkes to you in italian i would say u are quite fluent, and therefore i am not sure if my suggestions will work.
but i would say to apply it to things - listen to songs, watch movies, cartoons, read magazines. for me, that is what learning italian is about - it's about taking it out of the classroom and being able to use it in situations where i would normally use english. enjoy what you can understand, and enjoy learning what you can't.