In 1068, two years after Wang Fu's death, Su married Wang Runzhi (王閏之, 1048–93), cousin of his first wife, and 11 years his junior. Wang Runzhi spent the next 15 years accompanying Su through his ups and downs in officialdom and political exile. Su praised Runzhi for being an understanding wife who treated his three sons equally (his eldest, Su Mai（苏迈，蘇邁）, was born by Fu). Once, Su was angry with his young son for not understanding his unhappiness during his political exile. Wang chided Su for his silliness, prompting Su to write the domestic poem "Young Son (《小兒》)".