FHA Season Period Question

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Hello....

My husband and I are looking to secure an FHA loan for a property in Texas (Dallas). We live in LA. This is our first FHA loan. I'm not sure if we can live there yet or not. If his sister were to live there for the full season period plus, does that still qualify us for the loan? Any advice would be great?

Does it make a difference if we get a single family or duplex in this equation also?

Thank you!