Can a family survive on Rs 20,000 per month in this era of inflation?

You understand the majority of people in the country are in fact surviving on less than that? Thrive or live comfortably? No. But everyone is surviving

Depends on whether you are living in Tier 1 city or Village

If lving in a tier-3 city or lower, yes.

Value of money is relative. Earning 1LPM in Mumbai would mean a really tough life there but if youvare earning even 25k in a village, would mean a decently comfortable life.

The place is more important, not the amount of money.