Very bad site/game, deposited BTC 4 weeks ago won, and couldnt withdraw BTC, then i saw someone played on my account, maybe the admin. 
DONT play!
I didn't have any problems with withdraw in SatoshiKaroshi - you must wait for 4 confirmations. Try ask your siblings If they didn't play using your account (or maybe you shared your link with someone) DONT play!
