Girllll I'm so sorry for that, those people can't even be compared to you.
what I will advise you is to go straight to them and confront them, tell them what they are saying is a lie and they should STOP even if they are older than you. lay their mistakes in front of them.
(i know you might be scared but you should be confident okay cause they are causing damage to your family's image okay)
but if they didn't stop or Maybe you didn't confront them ( it's fine okay) then tell your parents about this, you have to tell someone even if it's your sister or your brother okay.
Incase they don't react to that ( I know this is hard ) then just leave that person saying all that pretend that you don't even see them and they don't exist (but if they talk to you actually talk to them like you don't know what they're doing).
smile in front of them, laugh and pretend they you're way better than them because you are that's why they are gossiping and saying all that ( your family is famous).
but I want you to get them puzzled and confused and their own nemesis would suddenly catch up with them.
you should do this because WHAT THEY ARE SAYING IS A LIE, SO JUST BRUSH THEM OFF OF SHIRT AND WALK LIKE YOU'RE THE REAL QUEEN, CAUSE YOU ARE.
I'M WITH YOU GIRLLL.
GOOD LUCK ✅✅