The thesis involves the theme of poverty risk in Polish households due to their biological type, in terms of multidimensional analysis of poverty. The biological household type includes, among others, households of large families, which provides a verification of a hypothesis that large families are more at risk of poverty than other types of households. In addition, there has been verified a hypothesis on differentiation of poverty risk due to the biological household type. The poverty risk research has been made using the TFR (Totally Fuzzy and Relative) approach. The analysis has been based on the household budget survey of 2012.