The most royal family of India is the one that did not leave any grand palaces, family photographs, playing polo and similar stuff.
This particular royal family is the most illustrious (unfortunately underrepresented in Indian history) royal family of India with 4 centuries of continuity, the only family that found a solution to the Sri Lankan problem, messed up SE Asia just for fun and left behind a legacy of architectural marvels. I mean they would have looked with amusement at all the Mewars, Gwaliors, Barodas etc. (which passes for royalty because we have photos of them) because their minor vassals would have been much bigger than these photographed royal families.
These folks did not not leave any palace located in the middle of the lake, but they did leave 3 UNESCO heritage sites within 20 square miles.
Built in 10th century
Built in 11th century
Built in 12th century
The most royal family of India is the Later Cholas of Tamil region.