<human>: Summarize the given text in a few sentences.

First of all, I apologise if this is a bit hard to read - I'm a terrible writer and english is my second language

Long story short - I was looking through the family archive out of curiosity and stumbled upon my mother's old soviet passport. I looked through the pages and to my horror discovered something very weird. Back in the ussr, you didn't get a passport util you were 16, instead there was a space for children in your parent's passport. 

Well, there was someone in my mothers passport. Birth year - 1975. This is years before my parents met, and I checked and they didn't include stillborn children in the passports. I knew that my mom had a very short marriage with a man before she met my dad, but she never mentioned having a baby. She generally doesn't  like to talk about her past in the soviet union, as I understand she grew up in a horrible family with her dad being violent towards her and her sisters. She didn't have any contact with relatives since  1980 when she left the soviet union. 

So what do you think, should I ask her about it? I'm very curios, and even somewhat frustrated that she docent tell me anything about her past. But of course I understand that it may be very hard to share such traumatic memories.
<bot>: It seems that I have a half-brother somewhere in Russia and my mother hasn't told me anything about him. Feeling doubtful about asking my mother.