How to add more sims in sims freeplay?

I have the sims freeplay on my iphone 4 and its all updated and I built my house from scratch I got the empty lot one and I have 3 floors and 5 bedrooms and I have two kids and its me and my husband but it says its too crowded and that I have to remove a sim or kick one out do I have to do that or is there another way or what? I read you can have more than 4 sims living in your house.

Well you would go to the map and click on a house that nobody has moved into yet and clock on it to either buy it, or if you already bought it and a sim moved out of it, you can tap add a new sim. But otherwise, about the 4 sim thingy, thats never happened to me i have like 6 sims in one home.contacts them on ea website if there r anymore probs.