If you are looking for a family visa then attestation of the marriage certificate attestation is mandatory. If you want to travel to another country you will need to apply for a visa and as a matter of fact, the visa will be issued only when officials have verified your documents.
First the marriage certificate is attested from the country where the marriage was done and then attest the certificate by the country where you are applying for the family visa. One must know that without a valid attestation you can’t get a family visa.
Like any another attestation process for getting family visa in foreign countries, marriage certificate attestation too is a key element to prove the authentication of the marriage and not stating it void.