What can I do inside the house?
First, it's only polite to have a brief chat with the LANDLADY.
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Now you're allowed to go to the STUDY (door on the left) to wait for Mr. Gordon ('s ancestor).
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He's there when you turn around to face the door, and he doesn't appear friendly.
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Talk to him about this and that (half a dozen items should do it) until the kindly landlady finally distracts him.
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You have the run of the room for a few seconds.
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You'd better hide that ALIEN POWER SOURCE before he takes it off you.
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Come back after you've hidden the power source.
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If you haven't done so already, try and locate where the power source will have to be plugged in when the time comes. You will need that information for later.
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When Mr. Gordon turns back to you, talk to him again. Willingly turn around when he asks you to. You have nothing (else) to hide, after all!
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Turn back around to face him. Talk to him again before being allowed, indeed urged, to leave the room.
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Before leaving the house, make sure to talk to the landlady again. She seems to be on your side.