I have read some where that if one does not know one's kuladeivam he can offer nallikera kanthadhwayam on all Pournami and Amaavaasya days to please the unknown deity and as luck would have it one may come to know of the deity by some means sooner or later.
Just make this offer at your Pooja room or where you sit before pictures or sit towards east and offer this blindly.Could you kindly explain this. Whom it should be offered? etc. Shall be thankful
for the information.
Balasubramanian
Ambattur