Internet - family problem?

My brother in law (15 yrs old) no social status comes to my house plays xbox live my husband tells him to leave at 10p but he doesn't he leave until 6am he leaves b4 we get up nd get ready for work its very very annoying he is here everyday our electric bill goes up oder room is all messy my 2 kids learning how to say bad words because he yells at da ppl he plays wit....my husband got laid off soo I pay for all da bills nd his munching off of us nd btw he lives like 50-100 feet away from us. So I want to put internet security turning internet off at a specific time can anyone help me with dat we have a motorola modem from qwest