Why does it feel good for the tucks to tell their secret?

The Tuck family feels a sense of relief and freedom when they share their secret about immortality because it alleviates the burden of keeping such a significant truth hidden. By confiding in someone, they create a connection and foster trust, which can be emotionally uplifting. Additionally, revealing their secret allows them to express their unique experiences and perspectives, giving them a sense of validation and acceptance. Ultimately, sharing their secret helps them feel less isolated in their extraordinary reality.