Like millions of Americans in less-than-ideal living arrangements, Rebecca Treon has tried to focus on the positive aspects of moving back in with her mother for the first time since she was a teenager. “You start to see the advantages around the six-month mark, after that ugly readjustment phase is over,” said 40-year-old Treon, who for the past year and a half has lived with her mother in the Littleton house where she was raised. “I love the bonds my kids have with their grandma.