Ok peeps i need some advise. stay with me its a bit long!

We had some neighbours over around xmas time and one of the kids (5yrs lets call him boy1) took a liking to dh showing him how to play the xbox. BIG MISTAKE! apparently he always asks his parents if he came come around and play it and they always say no. we do get along with these neighbours and often have a chat out the front.
A few weeks back we had a knock at the door. we thought it was strange but let him in ofcourse and he had a play with nixon and his toys. he told us his parents knew where he was but when i saw his mum wandering down the street i called her and he hadnt told them he was coming here!

Anyway we also had a street party at xmas time and one of the kids parents(call him boy2) that did not come some of the ladies were talking about, saying this kid is always coming over to their house, never goes home, even when its dinner time etc.

Well these 2 little boys have become friends and came over to our place about a week ago. After being here a while and making a mess i had to ask them to leave cause Nixon was going to bed (i also had to start cleaning as we are selling the house)
That same afternoon the boy number 2 that we dont even know came around. we were eating dinner so told him no nicely

I s##t you not either one or both of these boys have come around EVERY single day since. All they want to do it play the xbox which we continue to tell them its not set up.
They even saw me outside the other day and asked if they could come in i said no cause dh was cleaning and i was painting.
last night boy number 2 came around about 7.30pm, again when we were eating dinner.
im sick of telling them they cannot come in, i dont want to sound like a meany but really there is nothing here for them. if Nixon was older and could play it would be a different story.
they have just knocked on the door now and i didnt answer (also done this a few times)
do i really need to sounds like a prude and tell these kids parents they cannot just come over all the time??
I think they are both starting school this year so possibly only got another more week of it but honsetly its getting out of control! They were even playing with a security thing thats attached to our front door atm for the real estate to use.
Boy 2 wanted to explore the house that day he was here, but ive never met his parents, heard negative things about the family and dont even know the kid.

WHAT DO I DO!!!!!