A little moment that makes me love Goku is how anytime his friends kids ask him if he’s strong, he never tries to downplay their parents strength or make himself look better than them.
In the Buu saga, Trunks tells Goku that he’s amazed by how strong he is (this is after he showed off SSJ3) and says Goku might be stronger than his father. Goku says to Trunks that he’s not sure about that, telling him that Vegeta is one of the strongest fighters he’s ever known.
Then in DB Super, Goku is at Krillin’s house asking him to train with him again, but Krillin is unsure. Marron then asks Goku if he’s stronger than her dad to which Goku says that he is strong but he knows training with her father will make him stronger, never directly answering her question and instead switching it to focus on how strong Krillin is which gives him the encouragement to train again.