I Am Sam (2001)

Although Sam has the mental capacity of a 7-year-old, he has a daughter with a homeless woman who abandons them when they leave the hospital, leaving Sam to raise Lucy on his own. But as Lucy grows up, Sam's limitations start to become a problem and the authorities take her away. Sam shames high-priced lawyer, Rita into taking his case pro bono and in turn teaches her the value of love and family.