Answer:
In the book "Tuck Everlasting" by Natalie Babbitt, the Tucks became unchanged after drinking water from a magical spring. The spring had the power to grant eternal life to anyone who drank from it.
The Tucks, who were a family of four, discovered the spring while traveling through the woods. They drank from the spring and found that they could no longer age or die. They were stuck in time, frozen in their current physical state, never to grow old or die.
The Tucks soon realized that eternal life was not the gift they had hoped for. They were forced to live in secret and could never have a normal life like everyone else. They also had to watch their loved ones grow old and die while they remained unchanged.
As a result, the Tucks became bitter about their immortality and decided to keep the spring's location a secret, hoping that no one else would suffer the same fate. When they met a young girl named Winnie Foster, who had stumbled upon the spring, they warned her about the dangers of immortality and begged her not to drink from the spring.
In the end, the Tucks realized that they had to face the consequences of their actions, and they decided to leave the area and continue their never-ending journey elsewhere.