Should he pay for the air-fare?

So my boyfriend asked my dad if he and his Uncle can come and spend time on the boat with him this summer, do a boys trip. My dad said sure, and has asked if theyre flying down, in which I said yes. He then asked if they can pay for his air-fare since he's hosting them on his boat. Is that wrong of him to ask that?

Should he pay for the air-fare?
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