You need to be attested in all your documents in your country first.

Needed documents:

1) marriage certificate( EVEN THOUGH,ALREADY NAMES MENTIONED IN BOTH PASSPORTS)
2) birth certificate for all children
3) DEGREE CERTIFICATE

ATTESTATION IN UR COUNTRY:

1) All certificates should be attestation from ANY NOTARY REGISTERED LAYER 0R JUDGES IN YOUR COUNTRY
1) All certificates should be attestation from THE MINISTRY OF FOREIGN AFFAIRS in your country
2) All certificates should be attestation from THE EMBASSY OF QATAR in your country

IF U GO TO ANY GOOD TRAVEL AGENCY , THEY WILL DO IT ABOVE MENTION ALL, JUST GIVE TO THEM UR ORIGINAL CERTIFICATES.

IN QATAR,

1) All certificates should be attestation from QATAR MINISTRY OF FOREIGN AFFAIRS. (NEAR GULF CINEMA)
2) All certificates should be attestation from THE EMBASSY OF YOUR COUNTRY in QATAR(THIS IS NOT IMPORTANT, FOR BETTER TAKE IT,THIS IS NOT BIG COST...ONLY 38QR PER DOCUMENT)

ALL THE BEST.
DO DUA TO THE ALMIGHTY.