As Shrushti Kadaganchi mentioned, There is no way you can get a long term dependent visa for parents. Dependent visa is applicable to only your spouse and children. You can not use the dependent visa option for your parents, siblings or any other relatives.There is another way if you have good financial means. There is something called investor visa (I do not clearly remember the name), Countries like Portugal and Spain have this visa provision. This will grant them with EU citizenship/Permanent residence. Then with the freedom to move within EU states, they can stay with you in whichever country you are in Europe.Please restrain from calling this faking system or coming to EU on illegal means. Because, a person is shelling out possibly half a million to 1 million euros in EU to get this visa. In other sense, they are investing and moving a large amount of money to EU which the government is using for the welfare of EU citizens. This is perfectly legal and approved approach.Downside of this approach is that either you or your parents should have a huge lot of money to spend to get this type of permit.