(The picture belongs to Johnjoseco on Deviantart and is used with his permission.)
Twilight Sparkle loves her sister-in-law and ex-foalsitter, Princess Cadance, dearly. In fact she wouldn't have anypony else be married to her brother, Shining Armor, Captain of the Royal Guard!
However, the mare has had one long, brooding question on her mind since the wedding. When she gets the opportunity to spend some time with Princess Cadance, she decides to get her answer.
But will Cadance take Twilight's family question the wrong way at first or will this question only produce even more questions to be had?
(Considered to take place near the last two episodes of Season 3)