This is a question regarding the anime but any reference from the manga are also acceptable. Please include season/episode, etc.
Vegeta's pride is a recurring theme and fuels his rage during fights. He demonstrates this by toying with his enemies, letting his opponents beat on him until they discover for themselves how weak they are, and by letting his enemies power up or transform so that he isn't fighting a weaker enemy.
I seem to recall there being a point at which Vegeta realized that Goku was holding back so as not to hurt his pride and this angered him immensely; I think it was around the time Goku demonstrated his SSJ3 form and was a catalyst for Vegeta willingly allowing himself to be turned into Majin Vegeta.
But is there an instance where Trunks also suppresses his power out of fear that his father will resent him for surpassing him just as Goku always does? This question occurred to be while watching Vegeta fighting Cell after having trained in the Hyperbolic Time Chamber. He repeatedly refers to Trunks as being strong but never as strong as himself.
A citation for Vegeta realizing that Goku was stronger would also be nice as a supporting reference but I am seeking answers specifically regarding Trunks.