Why do I keep changing the pet I want?

The best way to convince a parent is do research. Guinea Pigs are the first pets I took care solely on my own. My mother made sure I read about them, calculated how much it would cost to get started, and made sure I had a steady source of income to keep caring for them (IE: Allowance). Guinea pigs are one of the more expensive and time consuming of the small animal group. They require very large cages and are extremely sociable and if you think you'll be busy a lot, then you'll need two. I will warn you, starter kit cages are good at first but they will grow out of them. I would make sure that you really think about it and if you still want them, then show your father that you have done your research and prove that you are willing to care for them. I find this is the best way to convince parents to let you get a pet.