Answer
Yes, one spouse’s income can be used to demonstrate that the family can be supported, provided that the relationship between the family members and the maintenance obligation are clearly documented. Documents proving the marriage, the birth of the children, cohabitation, and the primary earner’s income are usually provided for this purpose.
The income itself must be verifiable: a contract, certificate, bank statements, payment documents, or a professional certificate, if one is required for the type of income. It is important to show not only that one person has the funds, but also that they actually cover the spouse’s and children’s expenses. An unregistered partner may require additional proof of the relationship.
Do not automatically apply a single income to every relative. Adult children, parents, and siblings may be assessed differently, especially if they have their own grounds or the ability to support themselves. The clearer the family structure and cash flows, the fewer questions there will be about the application package.