In The Father, contemporary playwright Florian Zeller’s devastating drama, an elderly man lives in defiance (if not outright denial) of his rapidly advancing dementia. But even those who possess the most immutable of wills can be subject to debilitating delusions. The man facing this particular ordeal is André, an authoritative figure whose rigid sense of order has long governed all areas of his life, including his approach to parenting, a fact painfully evident to the grown daughter who must now care for him. Or must she? Familial responsibility is just one of the dilemmas confronted in this thought-provoking play. Directed by Ellen Fenster, this area premiere from Gremlin Theatre offers a spotlight role to Craig Johnson, with supporting turns from Miriam Schwartz, Peter Christian Hansen, Emily Grodzik, Matt Wall, and Olivia Wilusz.