Utilize the input text as a context reference, choose the right relationship between St George Bank and Westpac from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Swan also writes of the need to quickly expedite the takeover of St George Bank by Westpac and Bankwest by CBA.

Answer: parent_organization