A proposal from the Obama administration to prevent children from doing farm chores has drawn plenty of criticism from rural-district members of Congress. But now it’s attracting barbs from farm kids themselves. The Department of Labor is poised to put the finishing touches on a rule that would apply child-labor laws to children working on family farms, prohibiting them from performing a list of jobs on their own families’ land. Under the rules, children under 18 could no longer work “in the storing, marketing and transporting of farm product raw materials.” “Prohibited places of employment,” a Department press release read,...