He Wasn’t Lying
It turns out that Mark actually has a twin brother named Eric who, owing to an unfortunate lawnmower accident, lost his finger at a very young age. There was a legitimate reason why Mark had never previously told Sara about him.
Conflicts
In contrast to Mark, Eric turned out to be less of a fan of the so-called “straight and narrow” as the brothers grew up. From an early age, he got into trouble frequently, which resulted in frequent arguments between the brothers. However, Eric was not the only person acting in this manner.