Don't you just hate when you see more than there should be connected to your wifi router.
I went around the house asking if they were connected to my wifi and they all have access but none were connected as they know i use it for work purposes. I then started to think someone had used an APK to log into the wifi router which indeed there was. Lucky for me i knew the password to get into the inner workings of the router and found who was connected to the router and subsequently blocked the person connecting to the router.
My wife has a second router for herself and the kids which is limited on what she can use and i told her what i did and she went to check her router and she noticed the exact same person was connecting to her router. I showed her how to block the connecting culprit and to not delete it.
I'm not a mean person and i would be quiet cool with people if they wanted to connect but have the common decency to ask me first. I am not that technical by any stretch but is there any other way to get around others connecting besides changing the password and blocking individual androids who can hack in?