“…the house of our neighbor's” vs. “…the house of our neighbors' ”

We had Thanksgiving dinner at the house of our neighbors.

1. We had Thanksgiving dinner at the house of our neighbor's.
2. We had Thanksgiving dinner at the house of our neighbors'.

Which one is correct?

Solution 1:

Neither is correct; no apostrophe is needed with this construction. However, if you said '...at our neighbours' house', the apostrophe goes at the end if more than one person lives there, or before the 's' if the neighbour lives alone.

My neighbour's house (one person)

My neighbours' house (more than one)

The house of my neighbour

The house of my neighbours (more than one)

Solution 2:

The answer is 1. But please note that there is a basic syntax problem. You don't say both "of" and "’s", so the correct syntax is:

We had Thanksgiving dinner at our neighbor’s house.

Or: We had Thanksgiving dinner at our neighbors’ house.

Or with “of”: We had Thanksgiving dinner at the house of our neighbors.

But it also depends on what you want to say:

1. Refers to one specific family close or next to your home (probably this is what you mean)
2. Refers to several people within that family, or more families living at the same house.