Few people would relish the idea of taking their 91-year-old mother with them to work every day, especially if she had Alzheimer's disease.

Yet that is exactly what Bo Shulin, a 59-year-old street cleaner in Changzhou, Jiangsu province, has been doing for the best part of a decade.

Each work day, Bo gets up at around 5 am and dresses Xu Jinying, washing her face and brushing her teeth, before walking her to his motorized pedicab, which she sits inside while he works.