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family tree in SWI PROLOG

there is some error with the grandma , cousin, brother, uncle rules i tried so many rules but still could not find the correct one it returns false , please helpppppppppp /*rules*/ male(james). male(charles). male(william). female(megan). male(george). female(catherine). female(diana). female(elizabith). parent(james, charles). parent(james, elizabeth). parent(charles, catherine). parent(charles, william). parent(charles, megan). parent(elizabeth, diana). parent(diana, george). /*rules*/ […]