It depends on if you mean Hades, the land of the Dead - the Underworld itself, or Hades the god that rules the dead and is king of the land that takes his name. In either case, yes - there are many myths that refer to the place and its god, for one the labors of Hercules.
Yes they're many myths involving hades.
In the Greek myths, Hades' wife was Persephone.
In Greek mythology there were many myths concerning Hades.
Persephone and Demeter
No their are no myths that ever suggest that they did.
No stupid there not their myths
no. but in some myths he is older but in most myths he is younger then his sisters.
None that are recorded in the myths.
yes the one about his wife and queen.
There are many myths and stories which Hades is in, the most well known is that Hades kidnapped Persephone the daughter of Demeter, he also plays a part in Hercules myths, as well as when Orpheus tried to retrieve Eurydice after she had died.
yes and one of them is hades and persephone
No, Greek mythological gods are fictional myths that do not exist.