It'd be interesting to know what the ruling was in this case, but I haven't been able to find any follow-up articles. The answer is probably hidden somewhere in a court archive.
The story reminds me of that more recent case of the aunt who claimed that her 8-year-old nephew's "exuberant hug" broke her wrist
, so she sued him for $127,000 in damages. (Yeah, I know, she had to sue for insurance reasons. Perhaps this 1961 case had a similar motive.)
The Daily Capital News (Jefferson City, Missouri) — Jan 27, 1961
Tricycle Operator Said Too Reckless
STEPHENVILLE, Tex. (AP) — Eddie Jones, 3, was described as "a reckless and incompetent tricycle operator" in a $50,000 damage suit in district court Tuesday.
The petition, filed by Homer Wolfe against Eddie's father, Ed Jones, alleges that Wolfe's wife, Bertha, was employed as a maid in Jones' home when she was struck by a tricycle last Aug. 26. The petition alleges she suffered extensive injuries and mental anguish.
"Little Eddie, who was on his tricycle, gathered a full head of steam and without a warning yell of any nature propelled his tricycle with great force into the body of Bertha Wolfe while her back was turned," the petition charged.
The plaintiff contends that the senior Jones knew that his son "was a reckless and incompetent operator of the tricycle."