When two persons are descendants of a common ancestor but by different wives, they are said to be related to each other by

Option (1) is incorrect: Two persons are said to be related to each other by full blood when they are descended from a common ancestor by the same wife. Option (2) is incorrect: Two persons are said to be related to each other by uterine blood when they are descended from a common ancestress but by different husbands. Option (3) is correct: Two persons are said to be related to each other by half blood when they are descended from a common ancestor but by different wives.