So Your Adult Child Moved Back Home. Here's How to Set Limits--Fast by Orla McCaffrey When Mariana Martinez’s son Antonio Ortiz-Mena moved home after college graduation in 2018, he barely fit into the twin mattress from his childhood. Martinez and her husband agreed to set him up in the guest room with a new, full-size mattress. But when her son moved out 10 months later, he wanted to take the new mattress along. Martinez, a family dynamics consultant at Wells Fargo Private Bank, declined.