Ojichan's Gift by Chieri Uegaki

Ojichan's Gift explores the relationship between a grandfather, Ojichan, who lives in Japan and a grandaughter, Mayumi, who lives in North America. When Mayumi was born, Ojichan built a garden for her, one that they tend together every summer when Mayumi visits Japan. When Ojichan gets too old to care for both his home and garden, Mayumi hasto find a way to keep their tradition alive.

What is a responsibility you have that started at a very young age?