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It has been frequently said that Ignace Meyerson’s (1888-1983) historical psychology was opposed to his uncle Emile Meyerson’s (1859-1933) « principle of identification » based epistemology. However, when reviewing Ignace’s writings at his personal archives, a number of notes evincing his agreement with his uncle’s system calls the reader’s attention. The aim of this paper is to clarify the complex intellectual relationship between uncle and nephew. For this purpose, we will analyze their « philosophical » correspondence from 1922 to 1933. We can clearly identify four main points of discussion : Lévy-Bruhl’s interpretation, Ignace’s relation to positivism, the relations between Emile’s epistemological perspective and Ignace’s psychological outlook as to the role of images in thought, the notion of « transcendent reality », and according to Emile it encompassed all their previous disputes.