They just make such a mess. Casual, flippant filthy mess. DS is 3.5, so to some extent I get that he is learning etc but he keeps taking water from cups, bottles etc and tipping it over everything. DD is 7. They leave rubbish lying around (not helped by DH letting them eat in the front room, gives them crisps or whatever to eat there, despite me desperately trying to keep food in the kitchen due to their inability to clean up after themselves). They don't clean their toys away, DD has complete disregard for her things, she couldn't care less if they break or not, apart from momentary upset at the deed happening. Their bedroom is disgusting, even though I tidied it thoroughly several days ago and try to keep it tidy at bedtime with them helping.
Last night, I went to bed with a lovely tidy front room. The kitchen was reasonably tidy. But a few bits and bobs (empty drinks bottles on the side, some rubbish that DH chucked into the sink when he got home late last night from work 
)
This morning, the kids woke very very early and were sent to watch TV. DH got up at 7am ish, I got up a little later, and the front room had been trashed already! Cushions on the floor, toys lying around, drinks cups. Then DD without asking, goes to help herself to a sandwich (after breakfast), and nice as she is makes one for us all, lovely. Except there is now bread crumbs everywhere as she didn't bring a plate in, the kitchen is a mess again as there is jam, bread, butter all over the sides. That's just how it is, I tried to walk away and led it go over my head.
About to put some washing in the dryer before we head to the park for bike rides. DD walks up to a glass, in the sink, which is half full of red water from DSs experiment with putting s babybel wrapper in a glass of water. She knew I was upset about this making such a mess. They also both knew that I was spending 30 mins tidying so we had a nice tidy house before we went out. She picked up the glass, picked up an empty water bottle and poured the red water into the bottle. Except it spilled over the floor, down the washing machine door, onto white clean washing that I was just about to take to the tumble dryer.
I went bananas 
I asked them/DD if she thought my sole purpose was to clean up after her, so that she could do as she pleased? I asked her why she did it 'don't know'. I picked up the rest of it, and chucked it on the floor. 'why did you do that mummy?!!' why not?! I said? and then I picked up some toys from the table and chucked them casually onto the floor, walked into the hallway and pulled some clothes from my chest of drawers. I was so so so cross. I just saw red and felt so upset and angry. Not even angry, frustrated and upset and the casualness and speed with which they destroy the house. I said to them 'see, look at the mess I have just made?! But the difference is, there is no-one going to clean up after me! It's me cleaning it all up and so that's why I don't do this!' can't you just treat this house a little nicer? can you look after our things?
And so now, I am in a filthy mood and I can't shake it, I feel really tearful. DD is tidying her shitpit of a bedroom up as I told her to take all her toys out of the hallway and front room. I said that right now I don't care if she lives in filth but the rest of the house won't be like this. I have to tidy up both their mess, and my own mess caused by having a tantrum.
It's the second time in one week I lost the plot with the children. Although the last time was due to them playing by the car in a car park which resulted in DS running into the carpark road, a busy one and by the grace of god avoided being hit by a car (which all drive too fast where I was parked. Lesson learnt for me there, never park there again). I was so angry with them I actually swore. And then I cried.
I now also feel bad as the children looked at me like 'oh, mummy isn't happy' and they then looked so little. Which of course they are. They both came up to me holding hands, as I put the washing in the machine, and said sorry. And then I felt like a dreadful mother, which of course I was being. But, how old with DD be before she can be held responsible for being part of the family and cleaning up mess she makes?
I am not really wanting any YABU or YANBU etc, as I know my own behaviour was not great, but really, I just felt surrounded by mess and unable to control it and saw our imminent bike ride become further away. and the day end up being wasted, again and needed to let of some steam