Допиши недостающие слова в родословном дереве.John-grandfather.Mary__?Bob__?Sarah-mother.Betty___?Jeff-Brother.Tom__?

John — grandfather.John is a grandfather. Is John a grandfather?Mary — grandmother.Mary is a grandmother. Is Mary a grandmother?Bob — father.Bob is a father. Is Bob a father?Sarah — mother.Sarah is a mother. Is Sarah a mother?Betty — sister.Betty is a sister. Is Betty a sister?Jeff — brother.Jeff is a brother. Is Jeff a brother?Tom — uncle.Tom is an uncle. Is Tom an uncle?