Question: If I want to say that there are two people and each one of them is found in other side of the house. What is the correct way to say it? 

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> 1) There are two people in each side of the house
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> 2) There are two people in each side**s** of the house
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And by the way (in the same topic), are the two following sentences equal to the previous two - in the aspect of the meaning? 

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> 1) There is one person in each side of the house.
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> 2) There is one person in each sides of the house.
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Answer: 
*Two people on each side* means *two people on this side and two people on that side*—four people in all (if there are two sides).

What you mean is *one person on each* side, one on this side and one on that.

If you have not already explained that two sides are involved, you need to say so explicitly:

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> There is one person on each of the two sides. *OR*
>  There are two people, one on each of the two sides. 
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*Each* is used before a singular noun and a singular verb/pronoun is used for it.

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> Each **item** **consists** of 10 questions. (if there are two items, there are 20 questions)
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> Each of these people **has** some useful talent.
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> Each component can be replaced separately if **it** breaks.
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As the comments point, you're considering each item individually. Then:

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> There is one person on each side
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