Window security latch

A home owner from USA says:
Here are three pictures of my windows. Concerns are son can unlock and open windows so we need additional lock/venting mechanism, and we also want to be able to vent windows. This particular window is mullioned so I took picture of joint. We have 8 single windows and 8 mullioned (16 more windows but joined). We need something we can use to vent windows only a few inches and use as window locks and also we can close so we can open windows all the way when desired. Thank you.

Warmest regards,
User submitted photos of tilt latches.
Profile picture of Tom
Tom from SWISCO responded:
Hey, Daphne, thanks for posting. How about our 26-387 Face Mount Single Action Vent Lock Kit? Take a look at our video below, which shows how to install such a kit, and let me know if this can work for you.
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