1. Go to the front porch. There will be a hot spot above the door.
2. In Maria's (Nanna's) bedroom on the 2nd floor. Click on the blinds near the right side of the screen to go out onto the terrace.
3. In Devon's bedroom, same as Maria's bedroom, there is a hotspot that leads to the terrace/balcony.
4. On the rooftop terrace, turn left (where the tripod was for the camera setup), move forward (hot spot on the floor).
Spoiler below
Once you have all 4 use the build app to assemble them into your notebook.
Then use the Blue code book to on the codes in your inventory to convert all 4 into decimal values from hexadecimal.
Lastly, go to the safe in your dad's secret room. Use the converted codes on the dial to open the safe.