Kubernetes: "I make organizing large computer systems simpler, by getting the computers to manage themselves." (translation: something something computers, but only the "fancy" ones, so she doesn't try to get you to fix her Windows XP machine at home that she plays solitaire on:-P)
Doctors: "I make sick people well".
Neurosurgeons: "The human body is so complex, so people specialize, and my area of expertise is the brain."
Rocket scientist: "I make things go up properly, rather than boom."
There is always a way. You won't convey enough to get gran to perform any of these tasks, but you can make her feel welcomed into your world just a tiny bit.:-)
Abso-fragging-lutely. Communication is always a two-way proposition, and it is mandatory for us each to do our part to succeed.