Your attorney can advise you about hiring a PI and changing the locks. The only reason to hire a PI is if infidelity provides a legal advantage in your state. Otherwise, save your money. You know what is happening. The photos will only make you feel worse about it. You need to get separation and custody agreements in place ASAP. Until you have something in writing, you and your boys are not protected financially or legally.
Doing these things accomplish two goals: 1. Protecting you and your boys and 2. Forcing her to take responsibility for her decisions and their consequences. A positive byproduct of this is that you will feel more in control of the situation.
