I don't know English well and i don't KNOW really what the question is becks this phone translation really sucks, but from what i thing the answer is that a minor has all the same notes as c major (you have to excuse that i don't know how the fancy music words are in English and maybe this wont help because we are not even the same page)
Start in C major, parallel minor is C minor, relative major is E-flat major, parallel minor is E-flat minor, enharmonic respelling is D-sharp minor (which has 6 sharps).
F# minor is the enharmonic equivalent of G♭ minor, which is the subdominant key of D♭ minor. D♭ minor is a theoretical key with a troublesome B double-flat in its key signature. This is why you would usually see the key orientation of a song or passage with tonal center of D♭ notated around its enharmonic equivalent, C#.
D sharp minor
E Flat Minor
The enharmonic equivalent to A-flat is G-sharp; The enharmonic equivalent to G-flat is F-sharp.
D
e flat
Yes.
The equivalent of an f sharp is a G flat.
F sharp is the enharmonic.
D-flat minor is a scale that exists in theory only. Such a key contains 8 flats, so yes, the B is flatted twice. Generally, keys only go up to 7 flats or sharps. The enharmonic equivalent C-sharp minor with 4 sharps would be preferable.
F sharp is the enharmonic.