Conversation so far:
how many times has madrid won the club world cup
Real Madrid holds the record for most victories, winning the FIFA Club World Cup four times since its inception.
when did real madrid win the fifa club world cups
Real Madrid won the FIFA Club World Cup in 2014, 2016, 2017, and 2018
when did futbol club barcelona win the fifa club world cups
FC Barcelona has won the FIFA Club World Cup three times, in 2009, 2011 and 2015.

Question: are the teams rivals
Self-contained rewrite: are real madrid and futbol club barcelona rivals