@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();

		String sexStr;
		if (sex == Sex.Male) sexStr = "1";
		else if (sex == Sex.Female) sexStr = "2";
		else sexStr = "0";

		sb.append(familyId + "\t");
		sb.append(id + "\t");
		sb.append(fatherId + "\t");
		sb.append(motherId + "\t");
		sb.append(sexStr + "\t");
		sb.append(phenotype);

		return sb.toString();
	}