“For this reason, a man will leave his father and mother, be united to his wife and the two shall become one flesh.”
That verse, Genesis 2:24, is usually referred to in the context of marriage. But Pastor Ted Cunningham pointed out to me that it actually begins as an observation about parenting.
The verse declares that a man will leave his father and mother. It assumes that our children will leave home as adults, not as children who must then set out on a journey to become grownups on their own.