Answer:
IFRS 10 says that if the company A has control of the company B, which means that the Company A owns more than 50% of the company B. Then Company A must publish consolidated Financial stement which includes the sum of two company accounts, A and B.
So this means, according to IFRS 10, Finco, Serco and Euroco must be included in the Parco's Consolidated Financial Statements.