LukeSmith said:
Wasn't it said that the mother was Rachel Bilson's roommate in college?
Yes , he caught a glimpse of the yellow trolly car (that sits behind the kids when he talks to them in the future ) when he is at her apartment . So the mother is the roomate .
This what we know.
She was at the bar when evil ted ran through saint pattys day and he went back for his phone and left with her yellow umbrella .
She was in the class he wrongfuly went into to teach on his first day as a teacher .
She was the roomate of Rachel Bilson while Ted was seeing her.
What we know of barney's sister.
She is away from home going to college
We don't know her age , but if she is a senior or in the first year of graduate school it could match up .
No Tommorow was in season 3 . We are now in Season 7. So roughly 3-4 years after the event in No Tommorow.
So Barney's sister had to be at least 18 by then . To be in the bar legaly she would have to be 21. So in this seaon she will have to be 24-25 based on being 21 during No Tommorow , Ted will be 34 at the end of this season. I base that on the fact that Ted turned 31 during season 4 epsiode 24 the leap.
She of course could be older ta the time of No Tommorow. Barney is Ted's age or slightly older, So its possible that Barney's sister is a few years younger.
The hard fit of course is that Ted becomes a teacher in season 5 epsiode 1 , Definitions. So I'm thinking if she was still in college she would be doing graduate classes by that point. Typicaly you finish college with a bachlors between 21 and 22 .
She could have gone to a community school for a few years and trasnfered while moving to the city.
But she is the best match we have so far. She makes sense for being at Barney's wedding and we know he is getting married.