If such a relationship can be shown, is it a close one (Uralic and Yukaghir form a language family), or a more distant one (Uralic and Yukaghir are related, but as independent members of a larger language family, such as the proposed Uralo-Siberian grouping)?
To what extent are any non-coincidental similarities due to descent from a common ancestor, to what extent are they due to borrowing caused by language contact? .