What happens if our family gotra is not known?

If the gotra is unknown, the pandit uses the general formula ‘Kashyap gotra’ (the default gotra when the lineage is unknown) or the formula ‘ye ke ca asmatkule’ (those of our lineage), which includes all ancestors regardless of specific gotra designation. Not knowing your gotra is never a barrier to performing Pind Daan. The Prayag Pandits team advises on this at the time of booking confirmation.