i have some sympathy with your husband.
it is his home too.
was this arrangement properly discussed and agreed by him, or was it just imposed on him.
also he is trying to recover from a broken hip, which may make him aware of his frailty esp in comparison with a lively energetic toddler.
this may also cause him anxiety, that he may be barrelled into or toppled even by an unaware child.
SUICIDE OF MY GRANDCHILD - NO HELP
