this is the second time this woman has played in an alfred hitchcock episode where she knowingly allows someone to drink poison. she really is a black widow.
the father and son had such a beautiful relationship and she came between them just so she could get her hands on the old man's loot. true, the son should not have allowed his bitterness to get the best of him, but he was hurt because he thought his father didn't love him anymore.
and his father, the old fool, chasing after a piece of blonde tail like it was the holy grail. he should have known better. a good hitchcock episode.