Yes there is if you go on wikipedia on Google and look up Brendas got a baby it says probably to the 3rd to last paragraph it says it was wriiten by tupac by a girl on his block when he was little or...
The one shown in the video is obviously not, if your question is, if that happened in reality, well maybe. That the video is 'based on a true story' doesn't mean that a person named Brenda had that...