you will need to contact the municipality that the house is in (webster, rock hill, affton, etc) and inquire about the occupancy info for that area directly-if you are being discriminated against solely on the number of children you have and the house is legally 'set' for the right amount of children (you want to rent house B and you have 3 kids, it has three bedrooms, and the landlord is telling you no) then you need to contact the equal opportunity housing commission  http://www.ehocstl.org/ and ask about filing a complaint.
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some years ago when I was a single mom new to the area, I was refused rental of an apartment simply because I had children. I filed charges and the landlord was required to attend classes to learn what the laws are, and required to pay a settlement to both me and the state. It is so important to follow through on this, because there is no room for discrimination in our society-the people in 'power' *(property owners have a huge amount of influence in our economy/society) MUST adhere to the law and behave ethically-and it is up to us to report them when necesssary.
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I know how hard it is to find a decent rental-are you open to mehlville school district? Our old landlord was amazing and has a couple of thre bedroom properties with laundry-feel free to PM me if you want the info.