male(albertus).
male(albert).
male(ralph).
male(neal).
male(wayne).
male(nate).
male(ian).
male(john).
male(sean).
male(kyle).
male(daniel).
male(shane).
female(lydia).
female(may).
female(alberta).
female(joan).
female(amy).
female(bethany).
female(debbie).
female(cleo).
female(elizabeth).
female(kathy).
female(martha).
parent(albertus, ralph).
parent(albert, alberta).
parent(ralph, neal).
parent(ralph, wayne).
parent(ralph, martha).
parent(wayne, amy).
parent(neal, nate).
parent(neal, ian).
parent(neal, bethany).
parent(john, debbie).
parent(john, sean).
parent(john, elizabeth).
parent(sean, kyle).
parent(sean, daniel).
parent(lydia, ralph).
parent(may, alberta).
parent(alberta, neal).
parent(alberta, wayne).
parent(alberta, martha).
married(neal, debbie).
married(ralph, alberta).
married(albertus, lydia).
married(albert, may).
married(sean, kathy).
married(john, cleo).
married(debbie,neal).
married(alberta, ralph).
married(lydia, albertus).
married(may, albert).
married(kathy, sean).
married(cleo, john).
parent(debbie, nate).
parent(debbie, ian).
parent(debbie, bethany).
parent(cleo, debbie).
parent(cleo, sean).
parent(cleo, elizabeth).
parent(kathy, kyle).
parent(kathy, daniel).
parent(joan, amy).