Foster Lambert

Foster Lambert is the middle child in the Lambert family, the older brother of Cali and the younger brother of Dalton. He is portrayed by Andrew Astor.

Insidious
He seems worried about Dalton after he appears in a coma, and strangely says that he doesn't like it when Dalton "walks around" at night.

Insidious: Chapter 2
Foster appears in Insidious' sequel, Insidious Chapter 2. When Josh is possessed and attempts to kill Renai but is hit in the head by a baseball bat by Dalton, who had came back home with Foster. Foster hides in the basement with his brother. Dalton uses his tin-can-phone when he travels to the Further.