In his Philosophical Investigations , Wittgenstein introduces the notion of a ‘family resemblance’ to deal with certain problems. Talking of games and what they seem to have in common, he points out that there are no common features in virtue of which we call all games ‘games’. Instead there are, he claims, many different similarities and relationships; he says ‘we see a complicated network of similarities overlapping and criss-crossing: sometimes overall similarities, sometimes similarities of detail’. He then goes on to (...) add: ‘I can think of no better expression to characterise these similarities than “family resemblances”; for the various resemblances between members of a family: build, features, colour of eyes, gait, temperament, etc. etc. overlap and criss-cross in the same way,—And I shall say: “games form a family”.’ Wittgenstein also instances numbers as forming a ‘family’ in the same manner. This notion of a ‘family resemblance’ has come to be used by many philosophers to deal with a range of situations where there appears to be a difficulty in finding a single definite common property and yet there exists a desire to call some set of things by the same name. I myself have succumbed to this temptation. Perhaps the widest claim for the use of this device is that made by Mr Bambrough in an article entitled ‘Universals and Family Resemblances’ . This begins with the words ‘I believe that Wittgenstein solved what is known as “the problem of universals”’. (shrink)

Wittgenstein expounds his notion of a family resemblance in two important passages. The first is from The Blue Book:This craving for generality is the resultant of a number of tendencies connected with particular philosophical confusions. There is— The tendency to look for something common to entities which we commonly subsume under a general term. We are inclined to think that there must be something common to all games, say, and that this common property is the justification for applying the general (...) term “game” to the various games; whereas the games form a family the members of which have family likenesses …. There is a tendency rooted in our usual forms of expression, to think that a man who has learnt to understand a general term, say, the term “leaf,” has thereby come to possess a kind of general picture of a leaf, as opposed to pictures of particular leaves …. This again is connected with the idea that the meaning of a word is an image, or a thing correlated with the word. (shrink)