Twilight Velvet and Night Light

Twilight Velvet and Night Light are Rue Day's, Flurry Heart's, Princess Skyla and their grandson's, Twilight Sparkle's, Greenie Bean's and Shining Armor's mother, and Cadence's and Discord's parents-in-law.

The appearances they made so far were in  a flashback in The Cutie Mark Chronicles, A Canterlot Wedding - Part 2, and Magical Mystery Cure  and in The Crystalling - Part 2

Twilight Velvet, is voiced by her daughter's actress, Tara Strong while Night Light is voiced by Andrew Francis

Twilight Velvet
Twilight Velvet Sparkle (mostly referred to as Velvet to avoid confusion wiht her daughter) is the wife of Night Light and mother of Twilight, Greenie Bean, and Shining Armor. She is also grandmother of Rue Day and Flurry Heart.