You’ve had lots of good advice OP - the biggest thing you need to consider for the future is the plan for your kids.
As others have said, making the assumption they’ll go away to uni, self fund, and not return afterwards to the family home, is quite naive - lots of people now live at home until their late 20s due to the high cost of rent while saving to buy a property. So assuming you will downsize and release equity may not be feasible.
And if you can’t support them to top up loan fees for uni then they might also need to go to a uni near home - in which case they’d also be staying at home.
Assuming you have 4+ kids (hence needing a larger car) who are all teens, if you’re funding pocket money and activities for all of them I can see how that could add up. Do any of them have jobs?
Personally I’d be saying any of them old enough to work should be expected to get part time jobs and use this to fund their social activities and contribute to hobbies. And perhaps also start saving for uni. You’re setting them up to fail if you’re covering everything now and then in a couple of years expecting them to leave home and be totally self sufficient, when they’ve had no grounding for this.
They can also use their jobs to save for driving lessons which they’ll need to cover themselves. Best to get them into this mindset as early as possible.
Finally, is there any scope for either you or your husband to progress at work and get promoted or move roles to get a better salary? Often you can get a decent salary increase just from moving to a different company if you’ve been at your place of work a long while and been promoted internally. If not, another option would be to take on some additional part time work in evenings or weekends to top up your income.
When you can, I would downsize one of the cars to a cheap runaround (but whether that helps your financial situation depends on the nature of the car loans and how you’re tied in) - but I personally would prioritise clearing the CC debt as that’s the one which will really sting you if you run out of 0% options.