Do anybody know that whether we have to apply for wife and kid family visa, then there should be two seperate applications, with seperate document for each application. What i mean is that

1)2 Salary certificate (Original + Photocopy of it)
2)Educational certificate copy, both copies need to be attested or one attested and a copy of attested will be fine
3) Marriage certificate 2 copies again and both need to be attested or 1 attested is fine and make a copy of it to attach with kid application

Can somebody please advise me about it
Thanks