who has a house

[Alan]

Neither is acceptable.

I presume you mean:

He is one of my friends who have a house.

(meaning that they all have houses).

If, on the other hand, you mean that only he among them has a house, then you might say:

He, who has a house, is one of my friends.


but it would be unidiomatic in contemporary parlance. In such a case as this we would normally avoid a relative-clause construction altogther and say, e.g.

He is one of my friends (and he has a house).

or, alternatively:

He is a friend of mine who has a house.