public void setFather(Person far) {
if (far == null) {
if (this.father != null) {
this.father.children.remove(this);
}
this.father = far;
} else if (far.isMale()) {
if (this.father != null) {
this.father.children.remove(this);
}
this.father = far;
this.father.children.add(this);
}
}
