One who wounds a Canaanite slave of others is liable to all five categories of payment; Rabbi Yehudah says that “...a man and his brother...”
excludes a slave from humiliation payment. And the Rabbis? The slave IS
your brother in (some) commandments. Then can the slave testify in
court? No, since the slave is similar to a woman and a minor, who also
observe some commandments, yet can't testify in court.
A
wife can bequeath her possessions to her son, out of the husband's
reach. However, in Usha it was enacted that the husband gets back the
usufruct property bequeathed or sold by his wife.