Jason Osborne is the youngest bear cub in the Osborne family, consistently identified as the baby brother. He radiates constant smiles, reserving his biggest and brightest specifically for his mother, Carol Osborne.

He is the son of Arthur Osborne, a teacher, and Carol Osborne, who bakes. His older siblings include Aidan Osborne, active in sports; Ava Osborne, who gardens; and baby Melody Osborne, often seen on her rocking horse. Jason displays typical baby traits, particularly bursts of excitement and impatience, exemplified when he struggles to wait his turn for cake while other babies remain patient.

Within the Osborne household, where older brother Aidan often gets hungry after activities and Carol frequently bakes, food appears to be a motivating factor for Jason, fitting naturally into the family dynamic. His appearances contribute to slice-of-life depictions of family and village activities.