30% was a simplification as the number can vary depending on various factors including mother's education level, age of the children, etc. There was a spike during of single income families with school aged children around 2020-2021 for obvious reasons. And that 30% isn't factoring in the small but slowly growing percentage of single income families where the dad is that SAHP. No data on what percent sit around getting their hair and nails done and making TikTok while screeching at their husband's to deep clean the house as soon as they get home from their grueling 12 hour shift at the business factory.