Just download the tourist visa form from MOI site then just fill-up, sister's name, nationality, passport details and date of birth, then your name and ID NO.

Attach sister's passport copy, your pp copy with RP and wife's PP copy with RP. If you get a salary certificate from company (it will be an advantage) attach this with the documents. (You must submit a proof of relation) It you are Indian it is easy as the parents names are appearing on the passport.

Submit it in Airport immigration (7/24) pay QR.100/- either on the same day or next day you can print the visa from MOI site. it is very easy!!!! & convenient.

Airport Immig. Ramdada Signal........airport....almana signal...cornich road... first right cut.......then left side

regards & good luck