Comments of chapter undefined of All Hail Cousin Brother

hold up, hold up, I'm totally confused right now!

confused about the ages- her uncle's sons are between 14 and 15 in order to take the examination? Her third cousin they said was 18/19 but then tried to have her uncle be his friend? or did they mean his father's friend? How old is her father since he is the eldest son(numbskull who easily fooled by 'gentle women').