Tell him fine. You now want him to produce the evidence that will support this while maintaining your current life style as a family.
arrangements for school wrap around child care, who does it, who pays, how much
arrangements for dealing with sick children, how will this be shared between you how will this affect family finances re loss of income
arrangements for covering all the additional tasks you undertake on your non working days, cleaning, cooking, shopping, washing clothes etc etc. who will do those tasks, when will they be done, who will pay if they are outsourced.
school holidays.
you will need a breakdown of the advantages of your working full time, better pension, larger income compared directly to the disadvantages, outsourcing tasks to others, paying for wrap around and school holiday childcare.