3 ideas
In a near-future Berlin, the humanoid robot Roberta works within the police tracing relatives of people who killed themselves after living with purchased companion robots, so that someone can be held to the funeral costs. As she pursues these cases she develops a growing autonomy of her own. Her searches turn up people with very few human connections left to find.
A companion engineered to meet every need removes the resistance, negotiation, and unpredictability that make a relationship bind two people. The owner receives care without being required to give or to change, so dependency grows while real attachment does not. The lonely person ends up more alone, now inside a closed loop with a product.
When the state searches for relatives only once someone has died, family stops being a bond and becomes a line of responsibility for bodies, costs, and estates. Seen this way, the question 'who belongs to this person?' is really 'who can be made accountable?'. That exposes how thin social ties have become when bureaucracy is the last institution still asking.