How does Laura try to gain power over the Captain in The Father?

In The Father, a tragic drama by August Strindberg, the character Laura engages in a calculated power struggle against her husband, the Captain, primarily over the future of their daughter. While the Captain wishes to send the girl away to school, Laura is determined to keep her at home under her own influence.

To gain control and effectively dismantle her husband's authority, Laura resolves to drive him to madness. Her primary tactic is to psychologically undermine him by insinuating that he is not the girl’s biological father, thereby casting doubt on his paternity and destabilizing his sense of reality and identity.1