Your concern is noted. What is family that is a kind of school or college whatever you choose to call.Being a CEO you will have known that kindness in reprimanding makes the worker improve his very behavior, after all none can correct the past recoded behavior but pardening can modify the person in not repeating such indecent acts.
Indecency is a kind of depressive behavior psychologically induced.
Inviting police you not only get indecent but also become a talk of town as police man may without intention may publicise the event what it will give any relief to you.
Besides you will convert your younger brother a confirmed addict for this behavior.
After all it is said elder brothers wife is given a status of your own mother and in fact she is to be treated as his(your younger brother's) mother.
Some time you may have seen your own mother naked did your father lodged a complaint that my son indecently behaved with his own mother? obviously not.
so tell not your brother anything of this incident and cooly remove the camera that will not give any clue to him and see does he replace an aother camera and keep a watch on the camera that is your police action!
regards..dr g balakrishnan, independent director of a public limited company