India, Feb. 9 -- On Amrita Singh's 68th birthday, daughter Sara Ali Khan showered love on her mother through a heartfelt social media post. The post also reminded many of Amrita's remarkable personal journey, one that included her unconventional marriage to Saif Ali Khan and the religious challenges that came with it.

Even after years of parting ways, Amrita and Saif's love story remains one of Bollywood's most talked-about relationships. Their 12-year age gap raised eyebrows, with Amrita being older, but it was their different religious backgrounds that drew even more attention.

Amrita was born to a Muslim socialite mother, Rukhsana Sultana, and a Sikh army officer father, Shivinder Singh Virk. Saif, meanwhile, came from the royal Pata...