Why this generation prefers live in relationship to marriage

Earlier when we were kids, we knew Mummy Daddy, uncle Aunty, Granny Granda, Didi  Jijaji, Bhaiyya Bhabhi all got married. The living room of every family had atleast one Big Indian Family Wedding Picture. It was like a norm or a compulsion. One uncle and one Aunty staying together in a house and that too…