How to convince my parents to get a ferret?

Well I am responsible for my own cat two rats and sometime I feed the dogs.My point is that I really want a ferret.Yes most people are going to say that teenagers are going to grow out of thir pets or thay dont have the time to do the stuff that they need and all but im serious.I know a ferett is totally more responsibilty that two rats and a cat and two dogs oh ya a couple of fish but that dosent materr.But my room is a mess and my parent say I will grow out of a feret because my twin sister is like two minutes older than me and she didnt want to even touch a rat any more.And I cant stand being with out them.Well the mean part is that I got my rats taken away and are in my stupid sisters room and they say I cant even see the rats because my rooms not done.Well now there there in a little carrier case with no attentoin at all and barely any food and water!Well I protested she was abusing them and of course my dad stood up for her and said shes not she just forgot to put food and water in there!
hint hint dad!There still no food or water!
Well I snuck in my sisters room and cleaned out the cage and played for them until she fot back from piano leson.Well once I clean my room I will get the rats back and I already have a chart when to give my cat a treat and feed them and cleean themm and I have a litle table in my room that I keep locked in chore so that cant get mixed up with any of my home work..I keep all of there history of going to a check ups and I give grooming there and brushing teeth there and all of there med all locked up very tighlly so nothing can get in or out.Im also getting a cage for my rats thats a huge ferret cage but using it for my rats.so I can use it for my ferret.
I've done 2 months of research on them and once I clear out recliners,Because they can get crushed.And any bad furniture or spaces they can get stuck in and I he time to let my rats play for 30 minutes in the play pen I will let my feret play for 2 hours in the play pen with me and I got all the things togroom them witha and like 500 dollors of check up money and back up plans and I ahve perfely fitted floor plan for coled air too and as much time to be with this fellow.I know having a ferret is a lot of responsability and please dont think im inresponsible of my spelling.
But howcan I convince my parent of getting a ferret and of course I know all the shots and all and have the money to do that sohow can I.
by the way if you have a ferret tell me some cute stories and what you named him or her
Thanks sorry about my spelling!
oh if get a feret I would name the girls iris and eve and the boy tobe
Isint so cute!

Hi,

Make that the only thing you ask for on your Hanukah/Christmas/next birthday list. That way, it's almost necessary that you get one

maybe you should try cleaning your room. it seems that that is the only thing stopping you from getting your rats back, + a ferret.

my room got clen