Have you bought a bigger home to take in more kids...

We started this journey as straight adoptive. Since then we have short term fostered and found we were stronger than we originally thought and could handle the heartache of letting them go. Now, we are thinking about fostering, supporting reunion, but also with the intent to keep any foster placements that end up adoptable and that are a good fit with our family. We would be interested in fostering up to three kids and with our daughter, the max we would have would be four kids. The only problem is our home is not very big. We have three bedrooms, but only one bath. And one of the bedrooms is a one-kid bedroom (small). We would want to eventually move to a bigger home. A bigger home costs more money though, lol, and I was wondering if we could get a bigger home by using the foster care payments as income to qualify for more mortgage? What have you all done? Have you bought bigger homes to accommodate more children?