Children who return to live with their parents after leaving home are referred to as "boomerang kids." It's a rising trend in the United States due to the condition of the economy and housing market.Psychology for Living: Boomerang Children It has also been referred to as "cluttered nest" or "crowded nest" syndrome, in contrast to the "empty nest" that is experienced by parents when children move out.Vanier Institute of the Family: Contemporary Family Trends - Delayed Life Transitions
