Something to consider though....even if you convince them to adopt, one day the adopted sibling will be the age your brother is now and you will be in the same situation!

yeah I know
but hopefully I will be married and old enough to have my own kids

1. You cant just make your parents adopt. Adopting costs a lot of money. And if they dont want more kids, then thats their choice, not yours.

2. The way you're talking about kids (once they're 3 they arent cute anymore) sounds like a little kid who's parents bought her a puppy, and once the puppy isnt small they get rid of it. Thats probably not the best way to think about kids, if you're planning to have some of your own someday.

i know

I think every other kid in the world is adorable past that age I am just saying my brother isnt

The boy I babysit thats three is the cutest little boy in the world and my younger cousions who are 4 and 7 are still the cutest kids I have ever seen.
I am just saying my brother isnt!