If I accidentally go all out on an answer and make a really big image then I'll go ahead and upload it here. Anything smaller will remain exclusive to the Tumblr, however.
If you want the answer version then you'll have to visit the Tumblr![link]
Gibson Scratch and Aria Scratch.
If you question how those two could have a white coat child then I suggest you go view Pinkie Pie's parents before asking any questions. PINK OUT OF NOWHERE.