A method executes at a server system with one or more processors and memory. The server receives demographic information for a plurality of household members. The demographic information includes at least age and gender. The server receives television viewing information for the household. The server identifies one or more television viewing sessions from the television viewing information and selects one of the television viewing sessions. The server identifies one or more television programs tuned during the selected televisions viewing session and accesses demographic skew data for at least a subset of the television programs tuned. The demographic skew data for a television program identifies fractions of viewers of the television program from predefined demographic segments. The server associates a household member with the television viewing session at least in part by correlating the demographic skew data of the television programs tuned with the demographic information of the first household member.