A full list of source materials cited can be found in this Google Sheet.
Source 1:
Wayne, J. H., Mills, M. J., Wang, Y., Matthews, R. A., & Whitman, M. V. (2023). Who's remembering to buy the eggs? The meaning, measurement, and implications of invisible family load. Journal of Business and Psychology, 38, 1159-1184.
Source 2:
USAFacts Team. (2022, November 1). How has the structure of American households changed over time? USA Facts. https://usafacts.org/articles/how-has-the-structure-of-american-households-changed-over-time/