Passport renewal troubles

I need to renew the passports of my children [ expiring within 1 month ]
the passport application is asking for fathers passport number, [ which I do not have as we are divorced ]
the original document of divorce I sent out of Saudi Arabia for immigration purpose a long time ago ..
what hurdles will I face while renewing the passport of my children ?

The easiest way is to Get in touch with Indian Embassy, Riyadh, call them and enquire for the complete details !!
By the way you can ask for those details from your ex-husband !!