By default registry is joint tenancy or tenancy in common?

Your query lack certain details, Indian courts are normally not in favour of declaring a particular co-ownership as joint tenancy, unless the intention of the parties is clear. Thus, words such as “transferees take the land jointly/ as joint tenants/ in joint tenancy” or “the land is transferred to the transferees jointly or to the survivor of transferees” should be used to clearly indicate intention.

Joint tenancy: Each will have equal share in the property

Tenancy in common: If there is more than one owner, each share will mentioned specifically.

Only on perusal of the documents we can come to a conclusion.