The Tranquil watched his companion's rapid changes of expression with detached interest, tentatively categorizing the reaction as 'surprise' in his mental filing system. He did not know why Ser Ordhan should display such a reaction to his family name, or how he seemed to know his brothers, but there could be many viable explanations given the range of potential interactions between knights and Banns. Perhaps the man knew Mathieu through knighthood. Constans had never asked Ordhan to whom his service was pledged; the man could have been from anywhere, which opened a great number of possibilities.
"Yes Ser, Bann Lukaer and Ser Mathieu are my elder brothers. We are four; Desiderio is youngest. You are surprised?" This last he added as a means of verification, curious only if he correctly interpreted the knight's response.