I think the word you are looking for is duplex - 2 homes in one structure. Unless you mean 2 houses on one lot, which is different.
Before I can make suggestions on the house, I need to more information about the lot you are building on. What are the dimensions? Where are the trees on the lot, and around it? Where is the road? Which way is North? Are you allowed a basement, and do you want one? How do you want to orient the structure (in relation to the shape of the lot)?
This kind of thing is a hobby of mine.
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