@HB2022 I posted this upthread, but I think you need to reread this. Parenting under fives is a walk in the park compared to parenting 4 teenagers:
Expense: childcare, school uniforms, school lunches, school trips, mobile phones, laptops, university support, bigger car, bigger house, holidays, Christmas.
Stress: GCSEs, A levels, UCAS, degrees. The stress of parenting one teenager was bad enough let alone the thought of going through that 4 times.
Emotional cost: Friendship issues, bullying, relationship issues - do not underestimate the emotional roller coaster teenagers can put you through
Other: the drudgery of all that cooking, washing and cleaning, years and years of school runs and playdates.
What does parenting four children give you that three doesn't?