sangom
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Kula Deivam concept is as much a belief as, say, vegetarian Rama or "apaurusheya vedas". It can be eminently dispensed with but then nobody will be usually prepared to accept such a decision when the child's studies is in peril! So, if some one tells like "your Kula Deivam is deity X, in a temple which is Y kilometers to the east/south/west/north of your place of birth/present place of residence", then the person is satisfied, the temple also benefits!! Vaazhka Kula Deivam concept!