Adult Sheldon: While my sister and I are twins, we've always been different. By the age of two, I was reading books. Missy was content to eat them. By five, I had a healthy appreciation for a well-organized work space. My sister, less so.

Adult Sheldon: I didn't realize until years later that my father was only asking questions about lightning and thunder to cheer me up. In fact, he would often pretend to be dumb just to make me feel better.

Adult Sheldon: My father didn't always get the credit he deserved. The advice he gave me actually worked out pretty well. Of course, I never told him.
George Sr.: Talked to Billy.
Missy: Why would you do that?
George Sr.: No, it was good.
Missy: Stay out of my life.
Adult Sheldon: He may not have been the world's greatest dad. But maybe we weren't the world's greatest kids.

Adult Sheldon: Visiting Tam's house for the first time was an emotional roller coaster.
For example, it's traditional in Vietnamese homes to have gruesome religious iconography near the entrance. I did not like that.
However, it's also customary to not wear shoes around the house for sanitary reasons. I did like that.
Interestingly, one of the main ingredients in Vietnamese cooking is an extremely pungent condiment known as fish sauce. I did not like that.
But before every meal, it's common for everyone to wash their hands and face. I did like that.
Forks are not customary in a Vietnamese household. I did not like that.
And instead of napkins, there was one towel for everyone to share at the table. Seriously, what are they thinking?

George Sr.: Listen, why don't we just go there this Saturday and give it a try?
Mary: And if you don't like it, we don't have to do it again.
George Sr.: Or they'll love it, and they'll do it till they're 18, 19 years old.
Sheldon: I already love it.
George Sr.: My man. Missy? I believe there might be a Dairy Queen on the way there.
Missy: Can I get an Oreo Blizzard?
George Sr.: You know what I think? I think you're smarter than him.

George Sr.: Well, geez, I don't I don't know if I want some scientists pokin' and proddin' the kids.
Meemaw: Oh, but they wouldn't be poked and prodded. They just have to, you know, answer some questions.
Dr. John Sturgis: And maybe some puzzles and tests.
George Sr.: That's not too bad. Where is it?
Dr. John Sturgis: Houston.
George Sr.: Oh, it just got bad. That's that's a long drive.
Dr. John Sturgis: It does pay $50 an hour plus gas and expenses.
George Sr.: Really?
Meemaw: I told you to start with that.

Dr. John Sturgis: So, some colleagues of mine at the university are doing a research study on twins. I told them about Sheldon and his sister, and they were most intrigued.
George Sr.: Uh, what kind of study?
Dr. John Sturgis: It's a longitudinal investigation of environmental and genetic factors in the development of cognitive and other capacities in pairs of fraternal and identical twins.
Meemaw: You asked.