Ghar ka aadmi. A man of the house. The Rekhta dictionary gives “member of one’s family, family friend.” Its Hindi entry extends the meaning to relatives, a personal servant and an acquaintance.
Ghar ki baat. A matter of the house. Rekhta gives in Hindi a secret of the house, a matter between ourselves, a private matter.
Langotiya yaar. A loincloth friend. Rekhta gives “an old friend (from childhood), a very intimate friend, a playmate, a crony, bosom buddies.”