Undertale Theories

Alphys and Monster Kid?

Ever since Undertale existed, we have both been wondering..

Are Alphys and Monster Kid related?

And if they are? Are they close family, or are they far relatives?

Lets look at what we know.

MK mentioned having a sister..

We don't know Alphys's age... but,
Alphys is probably around Undyne's age.
And we can figure out hers.

strongfish91, Undyne's username, suggests that she is born in 1991.

This means Undyne is 24 yrs old.
Alphys is probably in her twenties too.

And monster kid should be around frisk's age, and.. that could be around 8-12.

So.. Alphys's age is double MK's age.

They are both yellow, but a different shade of yellow.

This means that they are probably not directly related.
Like, they can't be siblings.
Probably.

Next, they both have a thing for Undyne.
This does not mean they are related, but its a similarity.

Difference here is MK is a FAN of Undyne, and probably not in love with her, and Alphys is madly in love with her.

Then, they are both short.
Shorter than most of the monsters you meet..

And they could both be reptiles.
This is not proved, but it could make sense.

So,they could actually be related.
Maybe theyre cousins.
Or brother and sister.
But they are probably in the same generation, because Alphys was around 10 when MK was born.