As Harnack says, "There is no trace of any tendency beyond the immediate purpose of maintaining the true Christian life in the church and warning it against covetousness and against an unbrotherly spirit.
50) is on a line with the repeated denunciation of their "unbrotherly" conduct in later writings.
And apparently all the contents of his studio, with other gifts, to the devoted Melzi, whom he named executor; to Salai and to his servant Battista Villanis a half each of his vineyard outside Milan; gifts of money and clothes to his maid Maturina; one of money to the poor of the hospital in Amboise; and to his unbrotherly halfbrothers a sum of four hundred ducats lying to his credit at Florence.
How would you define unbrotherly? Add your definition here.