Please help me Rat related question?

I love love rats and now basically everything about them from hours and hours and hours of resarch i have made presentations , essays , 20 conditions (eg i will pay) i have tried begging now my heart really aches now they say no, what can i do to persuade them, i have a dog and hamster and their excuse is "2 pets is enough for the family" Please help me my heart is really hurting i told my parents this yesterday they said "poor you" but didn't say anything about getting a rat,

Thanks

I have a way to get rats, First of all get your birthday gift and then say them that you want a rat too, i'm sure they will not say u no.