Will a cosigner get us approved?

We are trying to buy a home since we already have an Fha loan for some duplex we bought 5 yrs ago we didn't qualify for the same loan because we no longer live there. They also told us that our debt to income is too high. The only way to get approved was with a cosigner. Is this true? We have a family member that is willing to help us, but I'm not sure if this is going to help us.

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