Who is the mother? (2)

If the last theory wasn't that mind blowing enough. This one absolutely will be!

Barney's sister, the kids mother?

The main theory is called "The Carly Whittaker-Theory". So well, lets get to the basic ideas behind it. When Barney meets his actual Dad Jerome Whittaker in the episode "Legendaddy"(S06E19), he got to know his fathers family. But the whole family? No! Jerome says that Barney has got a sister called "Carly", who is attending college right now.

And if you're a hardcore fan, you might been enlightened. Have you? Well, there are a few things that Ted says about their kids mother.

First: He'll  meet her at Barney's meeting, making it very likely to be one of the guest, which his sister would be.

Second: She attends college. From the episode "The Leap" we know, that
the Mother also does, she was even in the same room with Ted.

Third: If she marries Ted and Barney marries Robin, then Robin would literally be their "aunt" and Barney their uncle.

All in all, fans have claimed that this theory, though it's very tricky, seems to be the most likely. Here is my statement to that:

When I heard this theory the first time I was stunned and thought "well that could be really it", but after some thinking there are a few things against it. From the past I've learned that major clues are always given in episodes that are from Carter Bays and Craig Thomas, this episode wasn't. Although the "aunt"-argument is not really good, too.Thats because Lily is also called "aunt" and she has and will have no relation to Ted and the Mother. Nevertheless it is one of the theories that could really happen, so watch out for a girl called "Carly" and don't forget to comment!