If you have received no maintenance payments, you will need to fill in a Maintenance affadavit stating this and return this with your grant application. This affadavit is normally enclosed with all of the documentation you receive with the grant application form. You should get it completed and signed by a Peace Commissioner.
However, the income of both yourself and your husband now are taken into account when assessing eligibility for the grant. How you arrange your finances within the household is a private matter, but nevertheless if your combined income is relatively high, you may not be entitled to the grant. It is worth noting that, for every extra child you have in college, the income limits go up by around €4,500 per child. Also note that a sliding scale of grants apply - there is not just one income limit.
Contact your local VEC or County Council (who administer the grants) directly if you have any specific queries like this, they are normally fairly helpful.