The best plan would be for you is the Jio 399 Family Plan (Base Price) + 99 (Per Member Fee) + GST
Calculations :
For 3 Members
85 GB Data with 200 GB Rollover
(399+99*2)+18% = 704.46/Month
For 4 Members
90 GB Data with 200 GB Rollover
(399+99*3)+18% = 821.28/Month
Benefits :
1. Data will not get expired unlike Pre-Paid and it will get carried over upto 200 GB + Upto 90 GB Monthly limit.
2. Postpaid Bill can be used as an address proof.
3. If you have a business then you can claim GST + Can treat the whole bill as an expense of your Biz.
4. Priority customer support and better network in crowed areas as there are separate towers for Postpaid.