Corporations Code § 189
CHAPTER 1. General Provisions and Definitions
(a) Except as provided in subdivision (b), “subsidiary” of a specified corporation means a corporation shares of which possessing more than 50 percent of the voting power are owned directly or indirectly through one or more subsidiaries by the specified corporation.
(b) For the purpose of Section 703, “subsidiary” of a specified corporation means a corporation shares of which possessing more than 25 percent of the voting power are owned directly or indirectly through one or more subsidiaries as defined in subdivision (a) by the specified corporation.