String leluhur(BinaryNode pohon, String namaCari, String margaCari,
        String orangTua) {
        String hasil = new String("");
        BinaryNode cari = cari(pohon, namaCari, margaCari);
        char[] temp = orangTua.toCharArray();
        int panjang = temp.length;
        for (int i = 0 ; cari != null && i < panjang; i ++) {
            if (temp[i] == '1') {
                cari = cari.kiri;
            } else {
                cari = cari.kanan;
            }
        }
        if (cari == null) {
            hasil = "TIDAK ADA";
        } else {
            hasil += cari.getNama() + " " + cari.getMarga();
        }
        return hasil;
    }