Sarah says that 16 years ago when she was 11 years old, she found pictures of a baby girl named Sherri that she believed was her father’s daughter. She says she wrote a letter to Sherri but never heard back. Then, two years ago, she says that Sherri contacted her.

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“After we met Sherri for the first time, she decided she was going to move, live with my dad,” Sarah says. “At first, I was excited, like, hey she’s moving down here. I’m going to have a relationship with my sister and her children. But I quickly realized Sherri is all about chaos everywhere she goes.”

WATCH: Why Woman Says 'It Feels Like My Whole Life Is A Sham'

Sherri says it wasn’t until she received the letter from Sarah that she learned that the man who was raising her wasn’t her biological father. She says she confronted her mother, but that she denied Sarah’s claims, saying that she had only met this other man a few times and that the man she dated for 40 years was Sherri’s father.

Sherri says that after moving in with her father, “Sarah got upset and just started saying things like I was ruining her life.”

WATCH: Woman Accused Of Lying To Daughter About The Identity Of Her Father Tells Her Side of the Story

After their relationship soured, Sherri left, and the two haven’t been in contact.

In the video above, see what happens when they come face-to-face. And, on Thursday's episode of Dr. Phil, hear from Sherri’s mom. Why does she say she never told her daughter about the identity of her biological father? Check here to see where you can watch.

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Dr. Phil Tells Mom There’s An ‘Overwhelming Amount Of Evidence’ She Knew Daughter’s Father Was Someone Other Than The Man She Dated For 40 Years