Buzz Aldrin Vs Stepdaughter

Buzz filed the suit against Lisa Cannon -- his estranged wife Lois' daughter -- who helped run StarBuzz Enterprises LLC ... which markets and promotes Buzz.

In the suit, Buzz claims Lisa -- acting as his lawyer -- duped him into signing an agreement that gave StarBuzz all rights to Buzz's name, work, and persona.

Further complicating matters -- Lisa and Lois own more than 60% of the company ... and Buzz filed to divorce Lois back in June.

As Buzz puts it in the lawsuit ... Lois and Lisa now own, "Most of what he has acquired since the day he walked on the Moon."