% some facts above several family trees

parent(tina,william).
parent(thomas,william).
parent(thomas,sally).
parent(thomas,jeffrey).
parent(sally,andrew).
parent(sally,melanie).
parent(andrew,joanne).
parent(jill,joanne).
parent(joanne,steve).
parent(william,vanessa).
parent(william,patricia).
parent(vanessa,susan).
parent(patrick,susan).
parent(patricia,john).
parent(john,michael).
parent(john,michelle).

female(tina).
male(william).
male(thomas).
female(sally).
male(jeffrey).
male(andrew).
female(melanie).
female(joanne).
female(jill).
male(steve).
female(vanessa).
female(patricia).
female(susan).
male(patrick).
male(john).
male(michael).
female(michelle).

parent(frank,george).
parent(estelle,george).
parent(morty,jerry).
parent(helen,jerry).
parent(jerry,anna).
parent(elaine,anna).
parent(elaine,kramer).
parent(george,kramer).

male(frank).
female(estelle).
male(george).
male(morty).
female(helen).
male(jerry).
female(elaine).
female(anna).
male(kramer).

parent(margaret,nevia).
parent(margaret,alessandro).
parent(ana,aleksander).
parent(aleksandr,aleksander).
parent(nevia,luana).
parent(aleksander,luana).
parent(nevia,daniela).
parent(aleksander,daniela).

female(margaret).
female(ana).
male(aleksandr).
female(nevia).
male(alessandro).
male(aleksander).
female(luana).
female(daniela).