Need urgent help- regarding hand loan

Why would his sister and brother-in-law have anything to do with collecting the money in the first place? If you borrowed money from her brother then you should be paying it back to him, not to her. If he's nowhere to be found and hasn't contacted you about payments there's not much you can do. If you pay the sister, what guarantees that he'll ever get any of the money? He will come back to you complaining he didn't get paid and will want you to pay it all over again. If I were you, I'd tell them that as soon as he contacts you to let you know how to pay him directly then you will, but paying her just is asking for trouble.

Regarding calling the police and causing trouble, if there's no record of the loan they can't do a thing.

Cheers,
James
Expat-blog Experts Team

Thank you very much sir for your advice. I request you to give me any of the contact details, whom I can contact in case if my emigration is obstructed in the airport while going on exit.

Well bro no one can stop your immigration on this basis as there's no evidence or proof that you have taken some loan and even if there is its a total personal matter and immigration authorities have nothing to do with it. You might be stopped if you have some default payments from financial institution or something with SAMA.
Good luck

One more banned scammer later (The posts will probably have disappeared when you read this), and we see the most need to avoid any loans but real ones from real financial institutions.
Loads from the 'man down the road', internet thieves and other assorted sharks are always trouble.