Page "Ural–Altaic languages" Paragraph 17

Some linguists point out strong similarities in the pronouns of Uralic and Altaic languages.

Since pronouns are among the elements of language most resistant to change and it is very rare if not unheard-of for one language to replace its pronouns wholesale with those of another, these similarities, if accepted as real, would be strong evidence for genetic relationship.

It should be noted that the " s " in the Finnic second person pronoun " sinä " is a result of the ti → si sound law, and comes from earlier form * tinä, as in the plural form " te " and the Hungarian pronoun " te ".