[If one was] an adult and [one was] a minor, [if] the yavam cohabited with the adult and then with the minor, or [if] his brother [then] cohabited with the minor, he did not disqualify the adult. [If] the yavam cohabited with the minor and then with the adult, or [if] his brother [then] cohabited with the adult, he disqualified the minor. R' Elazar says: We teach the minor to refuse him.