You are not talking about long forgotten history. Indira, Rajiv etc are still current subjects. For your kind information, Indira was Rajiv's great-grand mother!. I need not mention that Feroze Gandhi was Indira's elder brother!! For your further kind information, Indira had married only thrice. First husband was a certain fellow, who was definitely not a Hindu or Muslim or Christian or Parsi or Buddhist or anything. The second and third marriages were with the same fellow called Destiny. Religion not known.
Be on the board in case you need further historical insights.