How to apply for birth certificate if I am an adopted child?

I am 21y ears old. I dont have birthcertificate .so i want make my BC.My question is that i am adopted child .am living with my adopted parents,my parents adopted from his brother,now i want to make BC if i make my BC with my adopted parents .is there any problems will occour in future while any property distribution if anyone give objection as i am adopted child.beacuase iam single child to my adptive parents .please give me clear suggestion for making my .thank you