Are the children the same sex? If yes, then two bedrooms are sufficient. If not, then, because of their ages, three bedrooms are required. There are no square footage requirements of which I am aware. Also, because your children are over 6 years old, the landlord is NOT required to test for or remediate for lead paint. FYI: NO potential landlord may ask if you even HAVE children...they can only ask how many related or unrelated people will be living in the household. I hope you find a great place and are soon settled in your new home.