OP In the old days, houses - unless you were rich - were never 'perfect'. Nor 'fitted' and glossy and plastic-coated. That's a modern expectation. Your mental health and your children's happiness are the most important things. So don't be stressed by wanting to get everything done at once. Step-by-step: if you and your children are safe and warm and clean and well fed, everything else can wait.
The electrics sound dangerous, so getting them sorted seems absolutely essential. So, probably, does making good the damage done to walls etc done during re-wiring.
The windows seem next priority - but unless absolutely dire can wait for a few years.
But otherwise:
*Does the loo work? Can you have a bath or a shower? Do you have plumbing for a washing machine?
- Do you have a kitchen sink, a cooker, a kitchen table and chairs, a fridge/freezer, somewhere to store food, somewhere to stand a kettle and a toaster? somewhere to stack plates ?
Almost nothing else really matters; not to begin with.
When I bought my first house, my Mother, when she saw it, burst into tears. It was grotty - filthy. But it was sound, structurally, and with a bit of work, NOT all at once - nothing heroic - it soon became very comfortable.
Now, on the sixth house I have owned, I still don't have a fitted kitchen or bathroom (I don't like them); in the kitchen, I have second-hand wood dressers and cupboards and probably third hand oak tables and chairs. I bought most of them about 20 years ago - they'll be good for another 200. In the bathroom, cheap solid wooden shelves and wall-cupboards. Almost all my other furniture was also really cheap second-hand, again, purchased over the years. (I say 'my' because my DH happily leaves this sort of thing to me - he knows I find it interesting. ) Other posters have suggested sources - charity shops are excellent (especially for old household linen - sheets, duvet covers, tablecloths, and, strangely, lampshades) I also can't find fault with EBay. Many 'decent' rug and antiques dealers have sites there and I have found them very good to deal with. I have a huge double sink on its own legs, bought (including taps) incredibly cheaply in a sale from a catering supplier. They also do other kitchen equipment - not pretty but strong and functional and cheap. I have secondhand sofas, tatty but beautiful oriental rugs, fabulous (to my mind -others might hate them) lined and interlined second-hand curtains. EBay is especially good for these.
As other posters have said, paint is a great quick fix. In an ideal world, you wash down the walls and do a bit of polyfilla-ing first- but you can do one wall (one hour?) at a time. B and Q paint (their posher range) is surprisingly good and cheap; they have some nice colours. I also rate Johnstones.
For what it's worth, the greatest mid 20th cent cookery writer - she really was pioneering - had a kitchen that looked like this:
artofeating.com/the-pleasures-and-challenge-of-elizabeth-david/ But probably few people would have time for that - or her, or her books - now.
Sorry if all this sounds horribly patronising; I really do not mean it to be. And my taste might not be yours - I'm NOT, NOT, NOT saying mine is any better. But as someone who has worked in and worked with many people in the creative industries who almost always have NO money, the sort of 'make-do-and-mend' things I'm describing above are very familiar among my friends and acquaintances.