Usage patterns
代わる代わる〈動詞〉to take turns doing (a verb)
Everyone took turns singing a song.
〈人〉が代わる代わる話すfor people to speak one after another, in turns
At the meeting, the attendees spoke one after another, taking turns.
代わる代わる看病するto take turns nursing/caring for someone
The family took turns caring for the sick person.