Model for Person

Person.php

<?php
use Doctrine\Common\Collections\ArrayCollection;

use Doctrine\ORM\Mapping as ORM;  

/**
 * Family relationship 
 * 
 * @ORM\Entity
 * @ORM\Table(name="family")
 * 
 */
class Family extends BaseRecord {
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     */
    protected $id;
	/**
	 * @ORM\Column(name="`type`", type="integer")
	 */
	protected $type = 1;
	/**
	 * Father
	 * 
     * @ORM\ManyToOne(targetEntity="Person", inversedBy="ffamilies", cascade={"persist", "remove"})
     * @ORM\JoinColumn(name="fatherid", referencedColumnName="id")
     **/
	protected $father;
	/**
	 * The mother
	 *
	 * @ORM\ManyToOne(targetEntity="Person", inversedBy="mfamilies", cascade={"persist", "remove"})
     * @ORM\JoinColumn(name="motherid", referencedColumnName="id")
	 */
	protected $mother;
	/**
	 * The children
	 *
	 * @ORM\OnetoMany(targetEntity="Person", mappedBy="family")
	 */
	protected $children;
	
	/* (non-PHPdoc)
     * @see BaseRecord::init()
     */
    public function init()
    {
        $this->children = new ArrayCollection(); 
        
    }

	/**
	 * Set the father   
	 * 
	 * @param integer fatherid The identifier for the father in the family 
	 */
	public function setFatherID($fatherid) {
	    if (!isEmptyString($fatherid)) {
	        $this->father = loadEntity('Person', $fatherid);
	    }  
	}
	/**
	 * Set the mother 
	 * 
	 * @param integer motherid The identifier for the monther in the family 
	 */
	public function setMotherID($motherid) {
	    if (!isEmptyString($motherid)) {
	        $this->mother = loadEntity('Person', $motherid);
	    } 
	}
	/**
	 * Return the ID of the father or FALSE if there is no father
	 *
	 * @return integer|FALSE
	 */
	function getFatherID() {
	    if (is_null($this->father)) {
	        return false;
	    }
	    return $this->father->getID();
	}
	/**
	 * Return the ID of the mother or FALSE if there is no child
	 *
	 * @return integer|FALSE
	 */
	function getMotherID() {
	    if (is_null($this->mother)) {
	        return false;
	    }
	    return $this->mother->getID();
	}
	/**
	 * Add a child to the family 
	 * 
	 * @param Person $child
	 */
	function addChild($child) {
	    $child->setFamily($this); 
	    $this->children->set($child->getID(),  $child); 
	}
	/**
	 * Add a child to the family using their id 
	 * 
	 * @param integer $childid
	 */
	function addChildByID($childid) {
	    if (!isEmptyString($childid)) {
	        $this->addChild(loadEntity('Person', $childid));
	    }
	}
}