Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". 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: Trulia, Zillow