In this forest-set family adventure, the famous Alvin Seville, Simon Seville, and Theodore Seville spend a morning arguing about their exact birthday, a detail even their adoptive father, Dave Seville, can’t confirm. With no clear date to celebrate, Alvin proposes a deeper quest: search for their long-lost mother. The moment Dave heads downstairs, he discovers the Chipmunks’ plan in motion and realizes the boys have headed into the woods—and he fears for their safety. To his relief, the Chipettes are in the house to keep him company while he and they set out on a rescue mission of their own.
As the trio ventures into the forest, the boys let their imaginations run wild, picturing what their mother might be like. While Simon and Theodore listen to their brothers’ questions about her, Alvin wrestles with a painful doubt—why would a mother abandon her children? Their conversations drift with the wind, and they pause to ask every forest creature they meet for any hint of a clue. The night deepens, and the search seems to stall, but the bond among siblings stays strong, even when hopes dip.
When night falls, the boys decide to return home for safety. Yet a sudden encounter with a wild boar jolts them off course, and they’re knocked unconscious after a brutal tumble down a mountainside. Help arrives in a surprising form: someone finds the boys and carries them to a welcoming, unfamiliar home. They awaken the next day to a warm room and the presence of their mysterious mother, Vinny, who is overjoyed to see them again. In Vinny’s house, a mix of joy and confusion settles over the group, and even Dave and the Chipettes draw close, eager to understand the reunion. Though the moment is tender, the reunion also stirs up questions about how much life has changed since they were apart.
Vinny’s heartwarming welcome is tempered by truth. The boys reminisce about their infancy, and Vinny soothes them with a lullaby she sang long ago. Yet Alvin’s resentment surfaces again as he clings to a belief that Vinny never cared for him and his brothers. Vinny explains her reasons in a quiet, honest voice: winters had grown harsher, food was scarce, and she chose to leave the boys with a kind man who could shelter them—Dave Seville—because he cared for the forest and its creatures. She admits that giving them up was heartbreak, but she believed it was the only way to keep them safe and fed.
A poignant choice looms: the boys ask Vinny to come back with them to the city, while Vinny expresses a desire to keep them close and to show them life beyond the forest. Alvin struggles with the idea of leaving Dave behind, stepping away from the life he knows. [Theodore Seville] and [Simon Seville] try to reassure their brother that love isn’t tied to place, even as a dangerous boar—angry and undeterred—returns to threaten Vinny. The beast charges Vinny, injuring her, and she teeters on the edge of a cliff before grabbing a branch. With a sudden lunge, the boar misses Vinny and topples into the river below, meeting a fatal end. The brothers rush to Vinny, tending her wounds and lowering the tense moment into relief.
Back at Vinny’s house, a heartfelt moment unfolds. Vinny’s presence inspires the family to rethink what home really means, and the boys rally around their mother with forgiveness and gratitude. Dave and the Chipettes, exhausted but hopeful, quietly follow the children’s lead as they work to heal the rift with warmth rather than anger. A family celebration follows, with Vinny hosting a party that blends forest memories with city life, a bridge between past and future that leaves everyone touched.
In the quiet hours that close the day, the brothers drift to sleep under a soft glow of contentment. A final, thoughtful confession from Alvin Seville reveals a changing heart: his earliest wish was for a family like everyone else, but he has learned anew that his parents—Vinny and Dave—love him deeply, just as he is, and their bond is stronger than any birth date. The journey ends not with a pinpointed birthday, but with a renewed understanding: family is not about the exact moment of arrival, but the love that surrounds you every day.
