Ryanair will formally agree to sell its 29.8% Aer Lingus stake to International Airlines Group (IAG) on July 16, marking a major milestone for IAG’s Aer Lingus takeover plans .
Take context from the input text and decide on the accurate relationship between 'Aer Lingus' and 'International Airlines Group' from the options provided.
Options: member of, parent organization, owner of, creator