Blood Brandy

@Crystalis  
Or Celestia did it…  
full
QueenChrysalisIsBestVillain
My Little Pony - 1992 Edition
Birthday Cake - Celebrated MLP's 7th birthday
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Artist -

She is our Queen
@Digi  
Magic did it. Seems like a good explanation.
Digi
The End wasn't The End - Found a new home after the great exodus of 2012

Both with Artifical Insemination and possible cheating, this would still only cover one of the two other possible breeds. Unless whatever did impregnate Cup Cake, other than Carrot, had a very mixed family tree. Plus you have to remember that the twins were barely a few min’s old when Carrot got asked why the kids came out as a unicorn and pegasus. If he stuck with his wife through the whole thing, which it seems like he did, would he be able to accurately say on the spot where his kids got the genes for their breeds from? Also I like to note that the kids look somewhat closer to their father rather than their mother thanks to their mane and coat color.
 
I just prefer to say pony genetics are magic.
 
Literally.
Mayojar77
The End wasn't The End - Found a new home after the great exodus of 2012

Does nobody in this fandom know what artificial insemination is?
Background Pony #2885
@Background Pony Number 17  
I might have to keep an eye out on Charlotte Fullerton’s twitter and ask her about it next time she has a Q&A session. Or possibly Jayson Thiessen. But personally, I think GLARGH has it correct.
Background Pony Number 17
My Little Pony - 1992 Edition

@GLARGH  
I’m pretty sure this is one of those “Getting Crap Past the Radar” scenes. The writers came up with a silly explanation that’s only plausible to a little kid, and played it straight knowing the adults in the audience would get what they were hinting at.
Background Pony #15BD
Jery: Mr. Cake your not the Father.
 
(That Divorce joke in “Ponyville Confidential” has a new meaning.)
Blood Brandy

@Gundlach  
I think he’d still have that face if the kids had scales and burped fire
Roboshi
The End wasn't The End - Found a new home after the great exodus of 2012

@boilerwash
 
There is a third option, The Equestrian version of a sperm donor.
amess

@GLARGH  
That’s my guess, just grasping at straws until they can do a proper ancestral search.
 
I barely know any of my heritage.
Gundlach
The End wasn't The End - Found a new home after the great exodus of 2012

Mr. Cake’s face is that of: “Denial? I’m not in denial.”
GLARGH

@boilerwash  
Wat
 
I really don’t see how it’s so difficult to believe that they both might just have had Unicorn and Pegasus ancestors in some point in time. Regardless of their stupidity in determining who exactly those were.
amess

Always wondered how one would visualize this.
boilerwash
The End wasn't The End - Found a new home after the great exodus of 2012

Anybody else find it hilarious that a show for 5 year old girls actually has a couple that swings (or Mr. Cake likes to watch at least).
Joshua
Duck - Duck cannon at high speed
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Since the Beginning  -

That kind of makes sense.
Smudge_Proof
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Since the Beginning  -

missing string
Ha, neat, actually somebody visualized that.
Lord WyrmSpawN
Solar Supporter - Fought against the New Lunar Republic rebellion on the side of the Solar Deity (April Fools 2023).
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My Little Pony - 1992 Edition
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Not a Llama - Happy April Fools Day!
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.
The End wasn't The End - Found a new home after the great exodus of 2012

Lingering Wyvern
Thanks for actually mapping it out.
Background Pony #4F2E
….?