The relative major key of Gb minor is Bbb (double-flat). However to make life easier, one could just say the minor key is F# minor and then the relative major would be A.
A flat major and its relative minor are key signatures with four flats.
If I understand your question correctly: G minor has two flats, as does B flat major.
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).
It depends on which key you are referring to, all the keys with flats are: F major (1 flat) B-flat major (2 flats) E-flat major (3 flats) A-flat major (4 flats) D-flat major (5 flats) G-flat major (6 flats) C-flat major (7 flats) Likewise the relative minors are: D minor (1 flat) G minor (2 flats) C minor (3 flats) F minor (4 flats) B-flat minor (5 flats) E-flat minor (6 flats) A-flat minor (7 flats)
The key of G-sharp minor has 5 sharps (it's the relative to B major). G-flat minor is a key that only exists in theory, because that key signature would contain 9 flats. The limit on flats or sharps in a key is 7.
A relative minor key is the minor key with the same key signature as a particular major key, for example D minor and F major both have one flat (Bb).
Relative major and minor share the same key signature but a different tonic note (a tonic note is the first note of the scale or in solfege tonic is DO). For example, D flat major has five flats in it's key signature and b flat minor has 5 flats in it's key signature; therefore, D flat major and b flat minor are relative.
The relative key is the one with the same key signature. For C major, it's A minor.
The key signature is E flat major, which is also, C minor, the relative minor of E flat major. You can find out what flat key signature you're in by finding the second to last flat (in this case E flat). It is the major version of that key signature!
F Major has a relative minor key of D Minor and has the key if B Flat.
The relative minor key for A major is F# minor.
The key with 6 flats is G flat major (this is the same as the key with 6 sharps: F sharp major). The relative minor is e flat minor (also called d sharp minor).
A flat major and its relative minor are key signatures with four flats.
If I understand your question correctly: G minor has two flats, as does B flat major.
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).
E flat
F major and its relative harmonic minor, D minor, have only b flat.