If I am unmarried and have less than 5 lakh per annum as income, am I eligible to get benefits under the PMAY scheme?

As per the PMAY guidelines, an adult earning member (irrespective of marital status) can be treated as a separate household, provided that he/she does not own a pucca (an all weather dwelling unit) house in his / her name in any part of India.

So you are eligible to get benefits of the scheme.

So, even if children (married or unmarried) are staying with their parents in a house owned by the parents (or on rent, in the same or another city), they can opt for PMAY provided they are earning and don't own any other home.   For a married couple living on rent and even if their parents own a home, will anyhow is treated as a separate household. However, if they wish to avail PMAY benefits, they will be eligible for a single house, bought by either of the spouses or both together in joint ownership.