Yes, Larry Klayman once sued his mother.

She once successfully sued a New York restaurant that didn't want to allow her guide dog inside.

A story is told that a certain established Italian designer once sued a young competitor for "infringement of leopard print."

He once sued the school over some missing plaster casts he donated.

He once sued the Roman Catholic Church for fraud, demanding that it prove the existence of heaven and hell.

The police chief once sued the town for free speech violations after the town supervisor insisted on handling all public announcements.

(This later Andrew Crooke, "the second," once sued his own mother in a business dispute.)

Surprisingly, he is also experienced in the law field and once sued his own mother because he simply did not like the birthday present she got him.

Colt once sued for the design of the K2 assault rifle suspecting the design was copied from M16.

I once sued for his hand, but he preferred chaos to an organized household.