He's a security robot. Your grandma somehow got ahold of him instead of a generic nurse bot. He's taken good care of her despite expectations. But now that she's passed he won't leave her house and is calling emergency servics regularly to bring her back. He doesn't understand her death. And he's being pinned as your problem since you inherited him with the house.

.

Cw: Death, talk of body decay, emotional trauma, violence, extreme possessiveness, dub/ (although I really doubt it with this bot.)