Parenthood reduces wealth by about 4 percent per child for workers ages 30-59.

according to a CRRB study.

and

The effects of children persist even after the transition from work to retirement. About half of U.S. workers are facing the risk that their standard of living will decline in retirement, according to the study. Each child raises that risk by 2.5 percentage points for workers in the middle class. Since so many Americans are behind the 8-ball when it comes to retirement planning, it’s wise to get serious about saving after the kids leave home – and while you still can. Once the kids are gone, the parents who fail to curtail their spending “may be headed for trouble,” the researchers warned.

Maybe that's I keep telling my kids I'm going to run away to Colorado in a tiny RV, never to be seen again.