Are there any iPhone apps that can help our situation?

My mother and I have been sensing some changes in my younger brother s(14yo) behaviour. The last we heard from him about his new iPhone he got for Christmas, he had downloaded a Facebook app called "messenger" he is always on his phone now-a-days and we can't seem to get through to him when he is angry. We think the causes of him being so angry may be Facebook messages on his phone.
How do my mum and I look at his messages without seeming intrusive.
Are there iPhone apps that you can get to obtain his private messages on Facebook?

Stop fooling that poor child

Your mom should just go get his phone and go look at it

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