Sonora's father was born in June, so she chose to hold the first Father's Day celebration in Spokane, Washington on the 19th of June, 1910. President Calvin Coolidge, in 1924, supported the idea of a national Father's Day.
It's hard to define blues. On a literal angle, it's the dance you do to blues music, generally involving lots of improvisation, closeness, and hip movements. While swing and blues have basics, frames, and moves... blues doesn't.
The blues is mostly about the blues scale, 12 bars and the I-IV-V chord progression. Most blues boils down to these three elements - most, but not all. There are so many sub-genres in Blues, it is difficult to name them all, but suffice it to say the R&B, Rock-n-Roll and Soul music are the direct descendants of the blues. There is also Jump Blues, Delta Blues, Piedmont Blues, Chicago Blues, Memphis Blues, Urban/Electric Blues, Zydeco and many more sub-genres that all relate to blues styling.