The Tucks have a lot of love to give. Over a century's worth, in fact. They shower Winnie with that love, and she returns it in full force, falling in familial love with them within twenty-four hours. Not too shabby. But if there's anything the Tucks have learned from immortality, it's that love isn't always easy. Throughout Tuck Everlasting, they often find themselves losing the ones they love—through no fault of their own.
Winnie loves the Tucks more than she loves her own family.
The most profound type of love in Tuck is revealed by Tuck's reaction to Winnie's death; he loves her so much he wanted what was best for her, no matter what loss it meant for him.