Telemachus says,
"Mother- but you are so hard that I cannot call you by such a name- why do you keep away from my father in this way? Why do you not sit by his side and begin talking to him and asking him questions? No other woman could bear to keep away from her husband when he had come back to her after twenty years of absence, and after having gone through so much; but your heart always was as hard as a stone."
This shows that he is loyal to his father and quite critical of anybody who should doubt him, including his own mother.