Originally Posted by
AirPloyment
I know a couple people that work there. As long as you are sending it directly to Qatar airways and not a recruiter, it shouldn't be a problem. That is strange they want your siblings passport and documents, but it maybe to make sure that they haven't been relieved from the airline. That is purely speculation, but I have seen people get disqualified because their uncle/brother got let go and then they won't hire you. This is not any policy that I am aware of, just purely speculation.
Sibling and parent info is used for travel benefit data. I don't think you should read too much into this request.
In other words, "Stay away from the 'black helicopters'"!