Image: Marriage of Dasaratha's four sons

Image source: Marriage of Dasaratha's four sons

Detail:

Image: The Wedding of Rama and Sita

Image source: The Wedding of Rama and Sita; illustration from Nine Ideal Indian Women (1919)

Image: Marriage of Rama and Sita

Image source: Marriage of Rama and Sita, circa 1750; you can see all four couples: Rama and Sita, Laskhmana and Urmila, Bharata and Mandavi and Shatrughna and Shrutakirti.

Details:

Image: Rama's marriage to Sita

Image source: Rama's marriage to Sita
(by K. Venkatappa from Myths of the Hindus & Buddhists, 1914)