melodic minor
harmonic minor
and natural minor
the natural minor is dirived from the relative major so if the relative major was C
C D E F G A B C you would count either 2 steps back for 6 steps forward and you would find that it is A, so the relative minor of C is A so the natural minor of A would be A B C D E F G A (w-h-w-w-h-w-w) the harmonic minor is pretty similar it creates a half step between the 7th note and the root, so in A minor it would go A B C D E F G# A (w-h-w-w-h-w-1 1/2) I don't remember or understand the melodic minor, and it sounds really similar to the major. so I don't use it when I write. to answer your question you would keep the original chords of the relative major for the natural minor, and the G# of 1-1/2 steps I don't know about. I hope that helps.