Rashi on Numbers 27:11/רש"י על במדבר כ״ז:י״א

1לשארו הקרוב אליו ממשפחתו TO HIS KIN THAT IS NEXT TO HIM OF HIS FAMILY — The term משפחה used in connection with inheritance denotes kinship only on the father’s side (Sifrei Bamidbar 134:3; Bava Batra 119b).