Refer to the input text as context and select the correct relationship between 'SABMiller' and 'MillerCoors' from the available options.
Options: legal form, position held, subsidiary, parent organization

All that said, this doesn't stop competitors including AB-acquisition target SABMiller and MolsonCoors joint venture MillerCoors from airing ads during games or from serving beers at their stadiums (as Coors has in Denver , for example).
subsidiary