Analyze the relationship between 'Airbus' and 'Airbus Group' within the context of the input sentence.
Options: creator, location of formation, legal form, parent organization

Industry sources have said Airbus Group is exploring increasing its stake in tandem with BAE Systems as part of a wider move that could see Airbus cede its 50 percent share of turboprop maker ATR to its joint-venture partner Finmeccanica.
parent organization