In Avengers: Endgame (and Agent Carter), we learn that Howard Stark's 'personal assistant' was called Edwin Jarvis. We have heard this name before, however: J.A.R.V.I.S was the name of Tony's AI that later became part of the Vision.
In order for Tony to name his AI after Jarvis, he must've been important to Tony. How did Jarvis and Tony have a relationship? Did Jarvis look after Tony, after the death of his parents?