A bug bomb is the first solution. About 15 dollars a pack if I am correct. You need to evacuate the house for a couple hours due to the toxic spray. I'll smell a bit funny but if you follow the instructions and heed the warnings then it should get rid of them.
We can't afford that. Dad doesn't know yet somehow, but when he sees, we're all dead. Because we're no better.
Water bottle trick (Works for yellow jackets too) -
Get a bottle (a standard 2 liter will work), fill it with a little bit of water about 1/4, and put in a squirt of dish soap in. Put a wedge of apple or other fruits so it hovers over the water. As the flies get full they drop into the soapy water and they get stuck and eventually DIE.
How do you hover fruit in a water bottle?
I saw loving 4 grouped on the light fixture, so I filled up this little bowl with water and splashed them with it. I thought the water would weigh them down and let them die on the floor, but all it served to do was piss the whole of them off. I need a solution I can do while in this house now, with no buying, because my Mom is Jewish and we're poor overall.