A commonly given example is of Urdu and Hindi (the standardized registers of the Hindustani language), which are mutually intelligible with each other.
Italian and French (both Romance languages) have about 89% lexical overlap, meaning 89 percent of words share the same characteristics and root origins.
Spanish and Romanian overlap less, about 67%, because while Spanish and Portuguese have undergone Arabic influence, Romanian has undergone many different influences over the years, particularly from the Slavic languages and Greek.
Along with a large amount of shared vocabulary, the Romance languages share numerous features of morphology and syntax because they are all continuations of their common ancestor, Latin.
Political and cultural events have largely dictated the decline of broad Scots as a standard variety in the modern period, and Scots is currently confined to largely spoken use and unofficial functions.