The Merck family is a German family of industrialists and bankers, known for establishing the world's oldest pharmaceutical company Merck, its American former subsidiary Merck & Co. (MSD), which is now an independent company, as well as the Hamburg merchant bank H. J. Merck & Co. The family still owns the majority of the pharmaceutical company Merck.
Merck & Co. is not owned by the Merck family
It's an independent company now. I think the system got it wrong because it confused the various Mercks in the context
( z1 own :polarity - :ARG0 ( z2 family :name ( z3 name :op "Merck" ) ) :ARG1 ( z4 company :name ( z5 name :op "Merck" :op "&" :op "Co." ) ) )