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When applying for ur sister's visa, the only proof would be a copy of ur passport as well as ur sisters'. Cos, of the surename, home address and parents names, they can confirm the relationship b/w u guys. And der aitn any problem with housing ur sister here in Qatar.
No issues as far as both of the passports show common parents and similar surnames
If she is entering the country on your sponsorship, ofcourse once you get Ok from the ministry that means you are qualified sponsor as brother and it is ok even to have a same appartment.
If she is entering and working in this country on her own (visa from different sponsor) then you guys just need to keep the necessary proofs handy IF and when required....
That is out of my best knowledge.
All the best
is somebody from the government of Qatar checking each and every house, if there are non married couples of brothers/sisters living together or not?? pls somebody tell me that there isn't such a BS in Doha!!!
Just a proof of you and your sister being siblings will do (birth certificate, passport ).