TOLEDO: Families whose children have been among dozens sickened in a northern Ohio cancer cluster have dropped their federal lawsuit linking the illnesses to Whirlpool Corp.’s washing machine factory.The families asked this past week to drop the suit although the owners of contaminated land once owned by Whirlpool plan to continue with their part of the case, said Chuck Boyk, an attorney who represents the families.It’s possible that the lawsuit could be filed again within a year, Boyk said.