Cheers to you that you are caring for others.
But since they are your siblings , i donot think you can convence them by your direct advice , instead you tell them about your glorous life outside Pakistan , your Elders and tell the stories of their success.
I myself comming from far away village and I have studied my first graduation from there , It is very hard to break the Ironcladed trends in our villages, which our society are inheritly having.
I was very desireous my siblings (Cousin etc) accompany me , but unfortunately no one did.
Your Cousins at least studying some thing , what about those who even donot go to schools?
You keep your warm contact with them and tell your stories.