can we share family plan of Apple when some members of my family are in India and remaining in the US ?

Yes you can create a new Apple ID, and also change the region of your current Apple ID.

A payment method and/or address is how the region is determined.

How to create a new Apple ID - Apple Support

Change your Apple ID country or region - Apple Support

One member of the family becomes the Family Organizer. This is considered the main account, who organizes the "family plan" called Family Sharing. S/He adds other members to the Family Sharing plan.

I think: each member's Apple ID has to belong to the same region so that the Organizer can add members to the Family Sharing plan. It does not matter what your actual geographical location is. (You could be residing in India but could be using an Apple ID associated with the USA region, for example.)

So if all of you have an Apple ID associated with the same region, it could be possible.

Family Sharing - Apple Support

Use your own Apple ID for Family Sharing - Apple Support

What types of content can I share with my family using purchase sharing? - Apple Support

All family members must reside in the same country.

You have to reside (having a residence address) in the U.S. to use the U.S. Apple store.

What Siabh post is not correct.