Irfan, Once you get a JOB in Qatar, you will be provided with RP (Resident Permit) after which you will be able to open a bank account, once you are done with this you will be able to provide six month bank statement to sponsor your wife + kid(s). for parents & brother you can just get them a visit visa which is valid for a max of 6 months, that too you can sponsor a visit visa for them only after you get a RP for your wife.
Irfan, Once you get a JOB in Qatar, you will be provided with RP (Resident Permit) after which you will be able to open a bank account, once you are done with this you will be able to provide six month bank statement to sponsor your wife + kid(s). for parents & brother you can just get them a visit visa which is valid for a max of 6 months, that too you can sponsor a visit visa for them only after you get a RP for your wife.