Parent's Mediclaim benefit in the hands of son

Planning to purchase mediclai  for my parents. Father is senior citizen but mother is not. Now I have heard that if son want to get the IT benefit from that parent's mediclaim then insured person will be parent as the mediclaim is doing for parent but proposer name should be the son who is going to pay. Please confirm whether this is true or it is ultimately depends who is paying i.e. parent or son.