Yan Shaojin, 37, cannot hold a spoon, dress himself or stand up.
He and his father Yan Yezeng, 79, live by the village of Xialong, Shuiquan county, in the Shanting district of Zaozhuang, a prefecture-level city in southern Shandong Province.
Yan Shaojin's mother died at birth in 1974. Within a month, Yan's brain swelled up with deadly encephalitis, a disease that left him mentally and physically disabled for the rest of his life.
Yan and his father subsist by a hillside orchard, receiving occasional assistance from local government and well-wishers.
Old Yan often considers killing his son and committing suicide together, but either the exorbitant cost of pills or an act of kindness continually pull them back from the brink.
What will happen to Yan Shaojin when Yan Yezong dies is anybody's guess, but one thing is certain: He will never again receive the same kind of love.