My Dad Had Triple Bypass Surgery Over A Week Ago.

My dad had triple bypass surgery over a week ago. He's been home now for 6 days. My stepmother has been caring for him around the clock since he's been home. She has returned to work and it's my turn to look after my dad. He's insistent on staying home alone. I would gladly go over and stay with him, but he insists that he will be fine.

My question- does he need someone with him around the clock? (Since it's only been a few days since surgery)