Dr. Benjamin Spock, the 86-year-old patriarch of child-care advice, says parents should relax so their kids can.

"Children respond to the tensions in parents, not the tensions in society," the white-bearded physician and child psychiatrist said last week. "We've got to take the pressure off kids."Spock was in Chicago to open a Field Museum of Natural History exhibition on families.

He told parents they should teach their children the spirit of cooperation.

Parents also should work toward eliminating grades in school and try to turn politicians' attention to issues like funding for day care, schools and health care, said Spock.