Yes absolutely! Children under 6 years old can accompany any team for free, as long as two players have paid to play.
For example, an adult might book a game for 2 players. The 2nd player might be any human aged 7 or older (another adult, a child). Up to three more children might also accompany this team for free. The maximum team size is 6 players. Each team must be accompanied by one adult. Two players must pay to form a team.
Note: we rate most of our games as ages 12 and up. The family version of Heroes & Villains was designed for families with kids ages 8 and up.