Which app or suggestions for surveillance

Hi, guys!
I'd like to look and hear the environment around my old father.
He is far some hundreds kilometers from me.
I don't know anything about surveillance but for me it would be enough to know some apps or phone that can do that.
It should better if you can hide the app, but
that's not essential.
I heard the app Spy Listener but in Play Store is not available.
Can you help me?

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