I'm one of those who would argue that £22k is a low wage for a lone parent of 2 DC, and £100k is a lot and that person should stop moaning.
However, when you crunch the numbers, the gap is nowhere near as much as the gross salaries suggest. You say you 'take home' £22k. Is this your gross salary? This is where we have to be clear as it makes a huge difference, but we will assume that your gross salary is £22k, obviously you will pay tax and NI on this, and you receive whatever benefits you are entitled to.
Mumoftwoyoungkids has posted some numbers:
^Family 1 - single mum, 2 kids aged 5 and 2. Mum works full time (so one in nursery and one in after school club etc.) Income of £22k. Rent of £650 per month.
Family 2 - single mum, 2 kids aged 5 and 2. Mum works full time (so one in nursery and one in after school club. Rent of £1650 per month.
Family 1 - post tax income = £1500 per month. Benefits (according to some numbers I chucked into “entitledto” making estimates as to childcare costs etc) £1900 per month. Total income = £3400 per month. Total income after rent = £2750.
Family 2 - post tax income = £5500 per month. Benefits 0. Total income = £5500 per month. Total income after rent = £3850^
So that huge £100k salary, that's nearly five times yours ends up as an extra £1100 per month, or 40% as no child benefit or help with childcare.
The other thing you have to consider is the hours worked for those salaries. You can probably assume that both these theoretical jobs are supposed to be 'office hours' because being a single parent and working shifts is incredibly hard to manage with childcare etc, but a £22k job is much more likley to be able to be done within those hours and forgotten about the rest of the time.
For £100k jobs, they are often 'always on' where to be able to leave the office before childcare closes, our £100k earner will need to take work home to finish off when the DCs are in bed, answer emails out of hours etc.