Erratic, this situation is a little different than yours, but your question made me think of Andy's step-cousins. They fostered/adopted a little boy, I think around 4 or 5. Not too long after they had settled in with him, his little brother entered foster care, so they took him in too. Not too long after that, the mom's drug addict sister had a baby girl she put up for adoption and Andy's cousins decided to adopt her as well. A number of years later, all the kids are doing great. I've always admired so much their decisions and their willingness to make a home for those kids.
Vibes and best wishes for your decision!