watched by other people using computer virus

If you have a partner and children, you will worry about what they do now. So do you want to watch them everytime?? A Thailand company made a soft Flexispy which is used with cell phone's. If you use this soft to your partner and children's cell phone, you can see their datas on your PC. But a Finland firm warned to use this soft, because it is like the Troijan horse, which is one of the computer virus. So I think we must not watch their private data if I want to know their action. Now there are many computer soft are being invented in the world. We should heed ourselves not to involve these computer softs. We need to think what situation we are living.