Grandparents in folding chairs at every game are a kind of loyalty that never needs explaining.

Turning up repeatedly to watch something you are not very good at yet is a plain kind of devotion. There is no benefit in it for them and no highlight to collect, just the drive, the chair and two hours of weather. Nobody in that generation tends to describe it as love. They just arrive.

Go and find them after the game rather than leaving with your friends. Thank them for coming. If they are too far away to come, call after a game and tell them what happened, which is nearly the same gift in the other direction.