what was kate's advice to george?

Kate advised George to start looking after himself and get married.

"Mother: Certainly. Why must you make believe you hate us? Is that another principle? ...That you have to hate us? You don't hate us, George, I know you, you can't fool me, I diapered you. (Suddenly, to Ann) You remember Mr. Marcy's daughter?

Ann: (laughing, to George) She's got you hooked already! (George laughs, is excited)"