If your mother did not die within "120 hours" of your father, then it would still go to her as the primary beneficiary. When she passed away, that is just another one of her assets (the inherited-401(k)) that would need to be divided to HER "heirs" or "divisees." ("heirs" for people dying intestate/without a will, "divisees" if she had a will or trust in place).
Answered on Jun 12th, 2023 at 9:12 AM