Sentence:  Hino was the <WSD>fourth</WSD> son of an elderly farmer who lived on the coast , in Chiba , and divided his life between the land and the sea , supplementing the marginal livelihood on his small rented farm with seasonal employment on a fishing boat . 
Meaning of the word marked with <WSD> tags:  coming next after the third and just before the fifth in position or time or degree or magnitude