I completely agree that we need to support families and working parents. Especially if we want to raise a generation of the next workers and tax payers to be healthy and happy.
However I don't think that demanding women out of the work place and back at home is the way to do it. Child poverty levels in our country are shocking. And yet the OP seems to think the way of doing this is to reduce household income and reduce the amount of people paying tax. And provide tax breaks too? How is all this being funded?
So many people like the OP have this one track mind that somehow it's a singular issue like two parents being at work somehow contributes to poor mental health of children and young people nowadays despite the fact this has not been backed up by research and would be impossible to quantify anyway because of all the varying factors in a person's childhood.
Yes poor quality childcare can be a problem but this can happen at nursery or at home. We also have a cost of living crisis, lack of investment in public services over the last few decades, lack of money available for schools, social work, health etc and less community places like sure start centres or community centres than before as well. Children nowadays have less freedom than they did before, they don't play outside like they used to and lose the skills in confidence, independence and resilience this brings. Some children have less outdoor time than prisoners. There's also a rise in social media which has been proven again and again to be harmful to young people.
These are the issues at hand causing harm. Not women going to work. Countries like Finland invest heavily in their early years education. People working there have to have a degree, there's a lot of focus on outside play and it's subsided too and a lower cost. They always out perform us on happiness and education rates and they have a culture where children attend daycare from an early age.
I would like to see progressive policies, not regressive policies to support children and families. Things like:
Better paternity leave
More investment in early years as mentioned above.
Flexible working
Affordable childcare
Investment in public services
More action on the harm that screens and social media do to young children
More work to be done on the importance of outside play for children and awareness of safe community spaces
I can't see it happening though!