You should contact the competent authority for information.
Competent institution
If you want to find general information about your origins which is included in the Population Register, you should submit your request to the State Enterprise Centre of Registers.
If the requested information is no longer stored by these institutions and has been passed on to archives, these institutions should explain to you how to request the information from the archive.
Examination of your request
In practice, it should not be difficult to obtain the requested data about your origins.
If you want to access information that is restricted and not generally available to the public you should indicate your reasons for obtaining the information in your request. The relevant institution will evaluate your request and decide whether to give you access to such information.
In taking this decision, they will balance your right to know your origins against the privacy of those persons whose information you have requested. Therefore, depending on your specific situation, the institution may deny your request or may only partially fulfil it. Such a decision must contain sufficient reasoning and also indicate where to appeal it and how.
Decision
The institution examining your request must take a decision no later than 20 working days from the day it received your request. If it denies access to the information you requested, it should explain the reasons for this and indicate how you can appeal the decision. Read more about how to complain.
Fees
Although you have the right to access information about your origins, you may be required to cover the fees for finding or making copies of the documents containing the information requested. Such fees should not exceed the expenses incurred to collect the information.