There have been several TV series recently centering on the intricacies of sisterhood. From Netflix’s “Sirens” to Peacock’s “Long Bright River,” this particular sibling connection is having a moment.

Based on the novel by Alafair Burke, the eight-episode thriller centers on two estranged siblings who are brought back together by a murder in the family.

The Better Sister' co-stars put their knowledge of each other to the test, revealing how well they really know details like Elizabeth’s real last name and the Aerosmith music video Jessica appeared in.