To add: the Dravidian languages of South India (Malayalam, Telugu, Tamil, etc) have no common ancestor with the Indic/Indo-Aryan languages of the North (Hindi,

To add: the Dravidian languages of South India (Malayalam, Telugu, Tamil, etc) have no common ancestor with the Indic/Indo-Aryan languages of the North (Hindi, Gujurati, Punjabi, etc) which are part of the Indo-European family. So while they may have some loanwords across them, the grammar and the majority of the vocabulary is totally foreign.