Bringing a stray cat inside?

We've been feeding a stray cat for the past nine months and he's the sweetest thing ever! He spends his days in our garden and his nights sleeping in one of the chairs outside but now its getting colder and he's decided to sleep on top of the guineas because we cover their hutch with a thick blanket at... show more We've been feeding a stray cat for the past nine months and he's the sweetest thing ever! He spends his days in our garden and his nights sleeping in one of the chairs outside but now its getting colder and he's decided to sleep on top of the guineas because we cover their hutch with a thick blanket at night.
Tonight it seems colder than it has been and i was wondering how to bring him inside for the night? He would have to be shut in my brothers room because we have 4 house cats and for obvious reasons we don't want them to mix with him yet.
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