If you're talking about a plural noun, add s to the adjective too!
In English, we say my brother and my brothers. But in French, if you have more than one brother, words like my and your change!
singular | plural |
---|---|
mon frère my brother |
mes frères my brothers |
ta sœur your sister |
tes sœurs your sisters |
sa voiture his/her car |
ses voitures his/her cars |