A Concerned big sister...

Here is a letter written by Nancy, big sister to George, Robert & Roy.  It was written to Robert's foster mother-whose surname is Peterson but of no relation.  In this letter, Nancy mentions that Robert "has gone back to you."  My guess is that Robert decided to venture out on his own, but realized that he wasn't quite ready, came back.  I imagine that all three of the brothers at some point had difficulty sitting put and wanted to start their life.