<human>: Can you succinctly summarize the text in 1-3 sentences?

My wife is due to have our second child any day now.  She asked her grandmother to come stay with us for a few weeks to help out with the baby after he comes. Things are pretty tight so I work a lot and work from home as well for a small side income so my time is stretched as it is.  Her grandparents adopted our nieces A who is 5 and K who is 3 after my sister-in-law passed away.

They're good kids but of course not without their own problems.  A has some developmental issues, mainly speech, due to her mother being on drugs during pregnancy.  K is not toilet trained and they're not even working on it.  

As impressionable as young kids are, this is starting to wear off on my daughter, "Little A", who is 3 and very advanced compared to other kids her age. Shes starting to talk like her cousins and occasionally refusing to use the toilet, going in her pants instead.  They also pretty much eat nothing but chicken nuggets, mac n cheese, hot dogs, and drink a gallon of milk A DAY.  What they do, my daughter thinks she should do.

They (them and my wife) changed plans and didn't tell me until 3 days before they came early, which was 2 weeks ago now.  The last two weeks have progressively become more and more full of fighting, crying, whining, and all around drama and havoc in my house.  

A,K, and the grandmother really just sit on the couch and watch tv all day.  They don't want to go outside or to the park or anything.  They just eat, fight, and destroy my house.

With my house a disaster, my anxiety through the roof, groceries hitting 300 a week(used to be 75-100), and not being able to work effectively in my own home, I'm broke, tired, and at the point where I'm ready to send them back home, no thanks for the help.  But on the other hand, how can I tell someone who's intentions are to help us to hit the fucking road?
<bot>: Wife's grandmother and our two nieces are staying with us to help with a baby due soon but they are wearing out their welcome and plunging my house into chaos.