For this question, you need a bit of background. All of my siblings and I play video games on either console or PC, and my older brother plays on both. He has his PC and PS4 connected to our router through an Ethernet cord. In the daytime (Whenever he is playing) my ping on video games is always around 800, but whenever he gets off (nighttime) my ping is around 5-30, would him being connected make my internet slower? Or is this just a coincidence? Seeing as my brother is older than me I can't really just make him shut it off because that'd lead into him probably attacking me, and he is much stronger than I am, so if this is the case how can I either get him or my parents to disconnect and connect wirelessly?