AMA's Carl Maroney is the person to ask that questions of. You will get a politically evasive answer, and decoding is required to find the real meaning,

but he is supposed to know.
JR will jump in here with a statement of the facts and therein you may receive some better information.
Now the question is whether the runaway plane belonged to the spouse -AMA member - of the non-AMA wife person or to another AMA member.
AMA insurance does not apply to the member's family.
AMA insurance covers liability of an AMA member's action involving non-family persons regardless if those persons are AMA or not.
IMO, a Club should evaluate their own Safety precautions for the merit of Safety and not just insurance coverage.