Many people take care of others. I know of grandparents who watch their grandchildren five days a week while the parents work. I also know of people who have their elderly parents living with them. In both cases, there is a degree of responsibility that transcends what we consider our responsibility as parents.
For whom is your character responsible? This is an important consideration. Even if your character lives alone, there must be someone in his life that demands attention. Is it a close friend who needs rescue? Is it a parent who cannot manage his finances without supervision? Is it a grown child who is still under the parent’s insurance?
Your task is to create a dependent for a character, then establish the degree of responsibility that the protagonist has for this dependent. Make it substantial in order to bring tension to the story.
Write a scene in which something occurs that tests the relationship. Perhaps someone falls ill, either the caretaker or the dependent. Perhaps someone falls and can no longer live alone. Perhaps someone loses financial independence and cannot afford to stay in her apartment any longer. Perhaps a natural disaster occurs that destroys the person’s home…and both caretaker and dependent have to make other arrangements.
There are many things that can occur that create tension. Your job is to choose one and write about it.
Have fun with this one.