Insert another ELSE-IF statement before the ELSE statement for Person1 or Person2 present.
ELSE-IF Person1 OR Person2 present AND Security System ON
Off: Security System.
You might want to add an AND condition to the IF statement as well.
IF Time between X and Y AND Alarm OFF THEN
Do stuff
I think you could actually get rid of the last ELSE statement as well then.
I think that would be the easiest way to fix what you already have. There are a bunch of ways to do this.
