The article analyzes changes in the number, size and structure of the Udmurt family in Udmurtia based on the population censuses of 1959, 1970, 1979, and 1989, based on a significant array of statistical data introduced into scientific circulation for the first time. For the first time, the size of families headed by the Udmurts was calculated in 1959. It was 4,1 people. in the republic as a whole, 3,5 people. - in urban settlements, 4,2 people. - in the countryside. For the first time in historiography, a grouping of Udmurt families was made, depending on the number of members living together. The typology is considered and the quantitative composition of Udmurt families with children according to the 1970 census is presented. At the same time, a comparison is made with the average republican family. It showed, in particular, that the Udmurt family was larger throughout the period under consideration, although the difference gradually disappeared. Most of the Udmurts had intergenerational families consisting of three generations and single-parent families. Moreover, in the latter, the parent was aged. Also, for the first time, the state of marriage among the Udmurts was analyzed: if for 1959 and 1970 in the sources it was possible to find only the number of married, then for 1979 and 1989 - also the number of divorced, widows who have never been married. Their age distribution is also shown. As a result of the study, it was concluded that the Udmurt family suffered more during the Great Patriotic War than the average republican family.