(a) the expressions “custom ” and “usage ” signify any rule which, having been continuously and
uniformly observed for a long time, has obtained the force of law among Hindus in any local area,
tribe, community, group or famil y:
Provided that the rule is certain and not unreasonable or opposed to public policy; and
Provided further that in the case of a rule applicable only to a family it has not been discontinued
by the family;