Any app to monitor messages sent, received on WhatsApp, Instagram, Facebook?

[MorStone]

What’s the best phone tracker app for keeping tabs on my kids without invading their privacy?
Would like to monitor my kids messages sent and received across WhatsApp, Instagram, Facebook.
Having done google search, found Vanarax.com (https://vanarax.com/) - Is it reliable option? Any feedbacks, comments please?
Thanks.