In Kerala (and many families which trace their ancestry to Kerala), every family identified itself with a 'Kaavu' (not exactly translated as temple) that may or may not be in their ancestral village. But they use a term call "adimai kaavu" (Temple to which they are bonded). The curious thing is even brahmanas, smarthas in specific, also seem to have picked up the concept and applied it to their familial lines. They have very specific practices associated with such a type of worship.
But the real question I am more interested in is what is the origin for such a practice, of bonding themselves to a kaavu? Does it have vedic origins and if not, how do the systems reconcile?