Can a Voip home phone call be recorded somehow?

If I am talking on one of the handsets in my house that has Voip phone service, can someone in my household record my phone call without them picking up another phone handset? For example, can that person be recording my calls on the computer? This person seems to know things I've said in calls when he wasn't in any rooms close to me.


They could be listening in on another handset or have a recording device hooked up.