In regards to extra children at rentals;
This is what my lease agreement has to say about the number of people at the property.
^See "Number of persons allowed to reside at the premises" for us it's 4 people.
^ clause 23 of statement terms.
I'm with a well known real estate.
It doesn't actually say anything about kids (ill keep looking as in sure I seen something but I could be wrong)
But I'm guessing kids just go under "Persons" IYKWIM.