The thing is, it shouldn't be that hard for two healthy adults to keep an average family home clean, not with the plethora of cleaning products and labour saving devices we have avaliable.
I used to clean professionally, including one off deep cleans and declutters, and the really messy/dirty houses were about half the time inhabited by women with health problems, DH problems, or both. I mean, how are you meant to keep a house tidy when you can't bend down, reach up, and dh is a lazy sod when it comes to cleaning? It was a pleasure to make their houses nice again, frankly,because you could see how stressed it made them
The other half were people who would have saved money and time by getting rid of the tons of useless shit they had lying about. If you have 3 teenagers who each own 20 t-shirts, then it makes it easier for the little sods to chuck a t-shirt in a heap after one wear, especially if you then lack the time and energy to absolutely be on their back about tidying and doing the washing - and even then we're talking teenagers here. That's 60+ t-shirts circulating around your house at worst, taking up room and gathering dust at best. Probably duplicates of each other too. Get rid of at least half of everything you own, and your housework will also halve,as if by magic.
Everyone will have different standards, but if the house is a complete shit tip, kids will not appreciate all the "making memories" if they also possess memories of feeling embarressed because they can't invite friends round to their home. A relative of mine lived in a very messy house as a child, and she often recalls the shame she felt when friends visited. It got to the point where she didn't invite friends back at all. She also went the other way in adulthood and would clean until 3am the night before visitors were due. I was in the house myself as a child - piles of dishes stacked high complete with hardened on dirt, piles of washing over the sofas that you had to move before you could sit, piles of random crap that lay on the stairs for months,little piles of things that sort of grew like mushrooms in random corners. Always a damp musty smell. Now, as an adult, I tend to think that piles of things you have to move around to get to other areas/clean around are a bad sign