3.16Relative minor versus parallel minor

These are easy to confuse.

Relative minor

C major ↔ A minor

They share the same notes/key signature.

Parallel minor

C major ↔ C minor

They share the same tonic.

But the scales differ:

C major:

C D E F G A B

C natural minor:

C D E♭ F G A♭ B♭

This distinction becomes extremely important for borrowed chords later.