I guess you are refering to imm5669E question 4e. Now generally your parents information you supply is part of your personal details because you are not filling a separate one for them as they are not accompanying dependant probably. If scenario that is true, and assuming your parent were refused visaat some point, but you and all your dependats were never refused visa your answer is NO. We all know our parents are part of our family but for this case if they are not accompanying dependant, they do not belong under that family member clasiffication for this purpose in my opinion. I hope this helps
Thank you...