Kidsitting and floundering

And it's only been 2 days! Please excuse any formatting. I'm exhausted and on a mobile.My partner and I are child free, we have 9 nieces and nephews between us so plenty of kids to soak up all the aunt and uncle love! I'm sitting a couple this weekend and for a couple of days after, boy and girl, 7 and 9. Have been little angels when they've stayed previously but this time they're driving each other nuts. Any game is dissolving into an argument, tantrums, fistycuffs etc. and today I've had to physically hold down or pull away just to get them to stop and listen. I try not to be soft, they don't get any junk food with me, they get outside for fresh air. It's the completely ignoring me when I'm trying to calm a situation or tell them not to do something like use the sofa as a launchpad onto the pouffe etc. I ain't fighting with them all day tomorrow, but I'm very wary of shouting because of the abuse I got growing up under a parent's quick temper.I know it's only a small tribulation compared to others on here, but I've gotten a bit teary about it just now, partly I know just through exhaustion. Tomorrow, partner is back at work, so I'm On My Own. Dun Dun Daaaaa!!! I'm thinking no pc/ tablet until they've been good enough for a few hours. Toast or porridge for breakfast (no fluffy pancakes or kid cereal), water but no fruit squash (oh the horror!) with an explanation that it's consequences of how they were acting today.Suggestions are welcome, I'm a bit stuck as none of kids have been so pita before this visit. I adore them and just want everyone to have a good time! via /r/Parenting http://ift.tt/2eGGZDR