Lots oguys are sending $$ back home to pay for various stuff. It depends on who you use to send the money back home, but figure on 75-150 dirhams/transaction to send stuff back.
AS for cost of living, depends on what you do. Groceries are damn expensive here and getting worse...if you have a modest lifestyle and keep the going out, boats, TV's to something reasonable you can get by on an F/O salary, with 3 kids it becomes harder with school fees, activities etc. You'd have to ask someone with a bigger family than me
I manage to pay a few bills off each month, but am not putting alot away as an F/O.