Update!
Well, the language barrier is a real problem. the parking the car under my window problem has stopped........so they could lay sod.
Over the weekend I tried to speak to them and showed them the flags. They were very nice and said, "I know. How are you."
They have dug up the old grass around the tree and have their chairs lined up around it. I am at my wits end! the good news is, that I emailed the fence guy and he was very nice and is coming this week and letting us make payments.
We ran into unforeseen circumstances and have not had the money, so this is very nice of him.
BTW, before I posted I ran outside to take a pic and they were all sitting there eating, under the tree, in my yard.
Oh, and I don't know if I shared this before or not, but I did have the tree trimmed and they watched the whole time, I thought that would let them know it is my yard. No, he said, 'It's ok, cut it. Thank you.'
I am not being mean and have come to terms with different cultures do different things. I have no control over what they do in their yard. I just am really sick of not feeling comfortable in my own bedroom.