Utilize the input text as a context reference, choose the right relationship between 'St George Bank' and 'Westpac' from the options.
Options: parent organization, position held, location of formation, stock exchange

Mrs Kelly was chief executive and managing director of St George Bank from 2002 to 2007 and CEO of Westpac from 2008 until early this year, overseeing a merger of the two banks in 2008.
parent organization