AnswerEX1-c
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Relations
son of someone: {<x,y>|x is the son of y} = {<Tom,Paul>,<Tom,Alice>}
father of someone: {<x,y>|x is the father of y} ={<Paul,Tom>,<Paul,Lisa>}
daughter of someone: {<x,y>| x is the daughter of y} = {<Lisa,Paul>,<Lisa,Alice>}
mother of someone: {<x,y>| x is the mother of y} ={<Alice,Lisa>,<Alice,Paul>}
enjoy watching football games together: {<x,y>| x enjoys watching football with y and y enjoys
watching football with x} = {<Alice,Paul>,<Paul,Alice>,<Lisa,Alice>,<Alice,Lisa>,<Alice,Tom>,
<Tom,Alice>,<Paul,Lisa>,<Lisa,Paul>,<Paul,Tom>,<Tom,Paul>,<Tom,Lisa>,<Lisa,Tom>}