Parental survey: Is there a way to "monitor" emails, or Whatsapp s from my own kid?

Without actually going through them no. In any case that would be a breach of their privacy. Believe it or not your kids have a right to their privacy.

You don't say how old the child is. If they are pre-teen then you can set up parental controls on there devices so you can restrict what they can access. But with social media I am afraid you can't.

If they are a teenager then they will hate you forever if you try.

Unless you are worried about their safety then I would leave well alone.

Remember when you were growing up? I bet you made some mistakes and poor choices and you learned from them. You need to let your kids do the same.

You should have their passwords.

You can possibly find that through them.