I don't own any of the characters, DC does.

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Cass was mad. No, not mad, she was fuming. She just came back from a visit with Cain at Blackgate and he had again refused to tell her who her mother was.
When she arrived at Barbara's Clock Tower the older girl didn't even have to ask how the meeting had gone. Cass' behavior told her all she needed to know. 'That bastard' she thought, "Cass", she said to the angry teenager who had planted herself on the couch, "have you ever tried to find your mother by using a DNA-test?"
Cass looked at her with an surprised expression and questioning eyes, "A what-test?"
"A DNA-test, it determines who you are related to by using genetic material and matching it to a database. Do you want to try it?", Barbara answered.
Cass nodded and quickly moved off of the and in the direction of the operating room where all Oracles equipment was. Barbara had to suppress a smile as she followed the younger girl.

After taking a swipe from the inside of Cass' cheek she fed it to the machinery that would identify the necessary markers to do the test. When she told the girl that this would take several hours she could literally see her good mood disappear and in an effort to cheer Cass up she proposed to watch a movie and pronounced the rest of the afternoon 'girl time'.
Cass smiled at her antics and agreed to stay, Barbara had a lot of movies and due to having Cain as a father she had never seen any of them when she was small.

Two movies later (Tangled and The Princess Bride) they were talking about how unlikely the movies were in real life when a beeping sound told them the analysis was done. Now Barbara could start a search trough the combined database of several agencies, police departments and that of batman himself. She told Cass that this would again take some time but this time the girl just nodded and said "I'll wait."
For a moment Barbara was inclined to just let her when a call for Oracle came in through the computer, she pressed the accept button and immediately a nearly hyper-kinetic voice filled the room. "Spoiler, calm down and state your business. I gave you this number for emergencies only", oracle said.
"Well, this is an emergency", spoiler replied, "Cass and I were going to do patrol together tonight but she isn't here and she is never ever late."
After Spoilers tirade Cass winced and quickly left the room to get her Batgirl getup while Barbara assured Spoiler that everything was all right with Cass and that she was about to leave for patrol.

When Cass came back in, fully clad as Batgirl, she heard Barbara end her conversation with Spoiler saying "Steph, just stay where you are, Cass will be there soon, ETA 3 minutes.".
She then turned her wheelchair to face Cass and said "The search will probably be done when you get back but Cass, don''t get your hopes up to high. It is far from certain that your mother is in any of the databases I have access to.".
Cass just nodded and left through the window to meet up with Steph.

When she came back after playing a last game of rooftop tag with Steph and Robin, who had joined them near the end of their patrol, she found Barbara asleep with her head almost on her keyboard. Cass was going to let her sleep because she certainly needed it when suddenly a pop-up showing Batman appeared on the screen. "Oracle, why are you conducting a search with restricted data of my operatives?", he growled.
As everyone who worked with Batman his voice was enough to wake Barbara up and after a few seconds to collect her wits she answered "I used your database to be real thorough while looking for any possible relatives of Batgirl. We haven't tried to find her mother that way before so there was a chance, however slim, that we might get results.".
Batman just said "Next time, tell me", then he simply ended the conversation by closing the pop-up.

Barbara then visibly relaxed. It took her a moment to notice she wasn't alone and just as Cass was about to make some noise to be sure Barbara knew she was there, the aforementioned said "Cass, if you come closer we can look at the results of the search.".
Cass went to stand next to Barbara who opened another screen that said the search had been done at 11:54 PM and that there were two hits. Barbara opened the program to look who it were. The first one was, unsurprisingly, David Cain while the second one was restricted. It took her a few minutes to hack the rather impressive encription and open the file. After it was opened she almost immediately said "This can't be right!".

This chapter is updated because it was in conflict with the next one (that I will post soon).

Please R&R. This is the first fanfic I've posted and I don't have a beta so if anyone is interested, please contact me. Also, please tell me if I made any mistakes when it comes to English because I'm not a native speaker (I'm Flemish) and I'm still learning.