That really sounds odd...When I re-enroll every year, during open enrollment, I can change dependents. I can drop my son if I choose. I don't choose...but I'm sure I can. I work for state government. Are you 100% sure you can't drop them? I can't imagine it's lawful to force a person to carry someone on insurance when they are an adult and capable of getting their own, even if it's thru the ACA.They can't be kicked off your insurance either up until age 26.