Birth Certificate for parent

When I enquired with Lublin Archives about a birth certificate for my mother, I provided 2 different last names because I was not sure who the natural father was. The archives responded the a certificate could not be found under either last name. That suggests to me that the birth was not registered or the records may have been destroyed because of the war. My mother was born in 1942. I do have 4 scanned documents that I received from ITS that suggest her last name was Slyszko, since my grandmother was still married to her 1st husband at the time. My mother was, I assume, adopted, after my grandmother got an annulment of the 1st marriage and remarried 2 months after that. The replacement birth certificate (declaration made in Muensingen Germany) was issued with the 2nd husbands last name. What I would like to know, going by the 4 scanned documents with the other last name, how easy would it be to make and file a birth certificate for my mother? Who can I talk to in this regard and maybe help me to make an application to have her birth certificate registered. I know I am taking a chance assuming my grandmothers' 1st husband was the father, but I chance I need to take. Especially since I can't ask mother mother or grandmother since they are dead and I can't trust my aunts to tell me the truth since they lied and have been caught lying and their memories may not be accurate after all these years.

How about the church / cemetery records; they may lead you to the diseased persons' relatives. I'd also give another shot and talk to your aunts as they may be the only way to find out the facts.

My aunts and I are not on speaking terms. They think they are punishing me for what they did. As for church records, that is going to be tough since I do not know the date of death for my grandmothers parents or where they are buried. I know there names and approximate year of birth, but that is about it. I suspect they may have been Greek Orthodox. Going on the scanned documents I have and if I assume them to be correct partly because my grandmother was still married to her 1st husband when my mother was born I would like to take a chance and apply for the certificate for my mother. I do have a copy of the marriage certificate for the 1st marriage for my grandmother. Plus I have a scanned copy of the annulment/divorce for her dated Sept. 1949 and a copy of the certificate of marriage to her 2nd husband in 1949. The declaration that the 2nd husband (the one I got to know as my grandfather) had made in order to get a passable copy of a birth certificate for mother, makes me think it as act of adoption

It may be a detective work, but there are a couple of Polish sites that allow to search for the diseased persons according to different criteria. For example: grobonet.com or mogily.pl. Possibly they have an option to choose years, but it may require registration or payment.