Question: why does lydia marry beetlejuice?
Answer: Lydia berates them because she hoped to use the book to summon her dead mother. ... Beetlejuice tells Lydia a passage from the book will resurrect her mother, but instead starts exorcising Barbara, and forces Lydia to marry him. To save everyone, Lydia agrees to marry Beetlejuice ("The Whole "Being Dead" Thing, Pt.