In Estonia, what activity do families traditionally do on Christmas Eve that involves relaxing at home?

Taking a sauna

What Greek hero fought in the Trojan War and was invulnerable except for his heel? Which reindeer is known for having a red nose? What film series follows the adventures of Dominic Toretto and his family? What unique festive seafood dish is commonly eaten at Christmas Eve celebrations in southern Italy? Which country was known as Siam until 1939?