Who is allowed to claim rental income?

[Ellie Narie]

If an unmarried couple wants to buy or build a fourplex, should both of them be on the deed? Who would be allowed to claim the rental income? Let's say one spouse works and earns money, and the other spouse doesn't work or earn any money. They share children. Can the non working spouse claim all the rental income, even if they both would own the property? If not, can they put the property in just her name, while the working spouse cosigns for the loan? 

What's a good way to structure this? An unmarried couple who have kids want to buy/build a fourplex, one spouse works and earns money, one spouse doesn't.