Real Estate Law
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This sounds like mother received a "life estate" in the house which means that she has the right to use and live in the house until her death and then it goes back to father.
If this is the case, then she could allow son to live in the house, but it would still be subject to her lifespan as the defining factor. Once she passed, the house would go back to father and he could evict son if he chose to do so.
But since mother apparently didn't receive ownership of the house or some percentage of it, just the right to use it for her lifetime, that is all she can transfer to son.