At some point after Frodo becomes Master of Bag End, one or both of his cousins comes for an extended visit. Either Merry or Pippin gets hurt or is sick, and Frodo becomes the main caregiver. I prefer the book-verse timeline, so that his cousins are considerably younger than he is. And Sam can be a part of it too, but I'd prefer he not take over Frodo's role as caregiver. Competent Frodo is definitely a plus.