Look at the picture. Say who Bill (Mag) is for... Example: Bill is a son for his mother. Mag is a daughter for her mother. ...for his / her grandmother. ...for his / her father. ... for his / her sister. ...for his / her grandfather.
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Bill is a grandson for his grandmother/grandfather Bill is a son for his father Bill is a brother for his sister У Мэг всё наоборот: для отца она daughter, для бабушки/дедушки то же самое но с приставкой grand. Для сестры она, я думаю, сестра.