Juha, I would still provide a bit more detail.
For example, for your parents or grandparents, you could be a bit more specific about which documents and identify where they are. For example something like (my apologies for mixing our families):
18 July 1906 Marriage record of John Patrick Smith and Paulina Jauch. Details withheld for 125 years due to Finland privacy laws; copy of record in files of Juga Soini.
Marriage record of John Patrick Smith and Paulina Jauch. Due to Finland privacy laws, record will be available after 18 July 2031, through (name of institution where record can be obtained). Copy of record in files of Juga Soini.
(It’s not clear which part of the marriage is to be kept private — when they were married or where, or even that they were married at all, but I hope you understand my intent.)
Please remember that the intent of citing our sources is to help others assess the quality of the claim and to be able to independently find the source.