Utilize the input text as a context reference, choose the right relationship between Trulia and Zillow 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.

With the closing of its acquisition of competitor Trulia in February 2015, Zillow Group ( NASDAQ:Z ) ( NASDAQ:ZG ) became the largest business of real estate and home-related brands on the Internet.

Answer: parent_organization