AnswerEX1-c

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>}

brother of someone: {<x,y>|x is the brother of y} = {<Tom,Lisa>}

sister of someone: {<x,y>>| x is the sister of y} = {<Lisa,Tom>}

dog of someone: {<x,y>| x is the dog of y} = {<Walter,Alice>,<Walter,Paul>,<Walter,Tom>,<Walter,Lisa>}

married to eachother: {<x,y>| x is married to y and y is married to x} = {<Alice,Paul>}

enjoy watching football together: {<x,y>| x enjoys watching football with y and y enjoys watching football with x} = {<Alice,Paul>,<Alice,Lisa>,<Alice,Tom>, <Paul,Lisa>, <Paul,Tom>, <Tom,Lisa>}

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