Since your preference is a diesel, there are limited options. The
Innova Crysta is the best choice, but if it’s over budget, it is worth checking the
Kia Carens Clavis. It’s not as spacious as the Innova, but it is decent, feature-loaded, and has a good ingress-egress suitable for the elderly. You can also split-fold the third row to open up the boot space, but with the three rows up, you will have to compromise on luggage.
If not a diesel, you can check out the
Maruti XL6 /
Ertiga. They are available at a lower price, have a strong
Maruti network, and can accommodate 7 with ease.
Finally, you can also check out used
Innova Crysta, as they are highly reliable and robust.