@sweetief - if it's any consolation, I've just refused to cook dinner for my pair, after they failed to do their chores/were insolent to me. Apparently they've both decided that they've "never liked"/"can't stand" the food I bought for dinner today (chicken breasts, which I was going to put a cheese/mayo mix on top of and then crushed crisps - their favourite dish, as it so happens...), so I've told them they're old enough to fend for themselves and to get on with it. Currently, eggs are boiling and a ready meal is in the oven. I could hear them sniping about me as they sorted themselves out, but... meh. I have thick skin. And at least they'll eat something tonight... I guess.
The 24 year old is stroppy because I suggested to her that she might like to stop waking one of the 12 week old kittens she brought into the house (she does this - 4 years ago, she arrived home with an 8 week old puppy, whom she rapidly lost interest in, and who is now my shadow) and certainly to stop kissing her on the nose/mouth area of the kitten's face! She won't accept that I'm not paying for the inevitable vet's bills when the kitten gets sick through lack of sleep (the other kitten has decided that the dog is mum and steers clear of everyone else) or a chest infection from daughter's snotty nose. Partly because I can't afford to, right now, if I'm going to have to carry her - but mostly because they're her responsibility, not mine! I already have an elderly cat to trip over in the middle of the night, I didn't need kittens added to the chaos!
The 16 year old "hates" me, because I'm "a fucking weirdo" who "doesn't understand" that he's without his precious cell'phone (he broke it, and it's off being mended), and how he "needs" to borrow mine to text his friends from. Which... no. Absolutely not. Highly inappropriate, and I definitely don't want them having my number! Also, I suspect he threw the 'phone onto something with some force, or solidity because the screen is smashed. This is the 4th time in 18 months this has happened, and I don't appreciate having to constantly sort it out, but... I am the parent, so I have little choice.
@Littleideasbigbook, we all feel like you do. We all have days where our children despise us... and we're left feeling pretty much the same about them (despite still loving them, of course). It's normal. The one thing which I found that helped, was literally saying "okay, if you don't like (the Sunday dinner you've been begging me to make for ages/having to do your chores/the fact that your washing hasn't been done, as you ignored me asking you to fetch it from the depths of the pit you sleep in, several times)... sort yourselves out!". Perhaps that wouldn't work with your youngest - but the older two are certainly old enough to fend for themselves (under discreet supervision, of course) every now and then. We're mothers, not martyrs. We have to put our own MH and self-worth first, once in a while, otherwise it'll explode out of us and genuine rows ensue. I'm sure you don't want that - and, really... neither do they!
Your ex sounds very much like mine in the aspect of letting them run wild/not parenting/showing no interest in them whatsoever. My son is supposed to see his father every other Saturday for 9 hours. Frequently, though, he's either decided not to go (at the last minute... refusing to tell them, leaving that for me to do!), or has come back early. Ex is meant to feed him dinner, but frequently doesn't (and my son's like a bottomless pit of hunger at the best of times!), he's not allowed to make himself a snack in ex's house, he never sees his father one-to-one, always with his younger siblings in tow... and he's admitted to me that he feels pushed out and the odd one out. His grandmother is also hyper-determined to involve herself in his friendship groups, which gets on his nerves (understandably), and nags him about his school work to the point where I'm pretty sure she was/is the root cause of his suddenly switching off regarding his education (this pre-dates covid, so he can't even use the 7 months out of school as an excuse, I'm afraid!). When he was very young, the build-up to his seeing his father et al was horrendous - and so was the come-down from the brief visit. Now he's older, he votes with his feet - but still takes it out on me (he was there yesterday).
(because it does get easier... I hope!
)