Patent for a blank modular book (FIG. 1), the modules being distinguished by tags (1), each having the same number of pages, designed to be filled in by the members of each generation of the same Family, whatever they may want to write, each module being provided with transparent plastic bags for keeping photographs and documents, thus, in view of its long life extending for many centuries and even millennia, the book will be a material sound link in the Family, and can even result in the formation of a true "Clan" and, in view of having this characteristic of a very long life, it requires the protection of a highly resistant case (FIG. 8) which, besides enclosing the book, will have a number of small closed compartments (13) provided with port-holes (16), besides a removable metal plate (11) to receive low relief engravings on its two faces as time goes by, what will result in the construction of a kind of "family tree" of the Family and, finally, since the case is aesthetically refined the whole assembly is also designed to be an object of adornment for the house (FIG. 8).