Hey guys could you please suggest which health insurance is better for a parents?

Don't take recommendations from random people here. Try Ditto and get in touch with their advisors. I'm not affiliated with Ditto and have bought health and term insurance through their recommendations and 100% recommend them.

Even Best Investment
You will thank me later. They cover the OPD fees upfront. I had an existing insurance from Niva Bupa yet got ahead and got this. Worth every penny. Dermatologist are also covered for OPD. Get 4000/- off on premium.

https://even.in/?ref=0X21C