A Pre writen Essay to give to my parents on y i should get a genua pig or any other rodent like that please?

My Dad is really strict and says I'm not responsible enough to have anything...I have had a turtle and goldfish but I really want a hamster,gerbil,or genie pig...I have done research on all of them and I really don't want a gerbil because it says there not to cuddly and I understand that rats are like the dogs of the rodent world in all but I know I would never get that=[ I want something to hold and cuddle with please and I'm turning 13 on Jun 15 but I will get my presents a week late cause I'm going to visit my uncle that week and ill be with my mom 2 days before my dad gets back and she wants to get it for me.....I have had a ferret in the house but it was my sisters and it stunk really bad but I will take care of it I promise I just need a way to show him that and I was gonna write an essay but I don't know what to say=[ so can u please help me?