Pappa Smurf and Azreal. It's a well kept secret.

Make believe. They did't have to say what was allready obvious to the audience. It's a cartoon. It's not suppose to have the truth in it to mess with the magic. Didn't Spongebob survive out of water? Patrick followed, because it's a cartoon and that's what they do.

Back in highschool Smurfette had a bit on a drikning problem. Then, one night, a friend turned her on to coke and heroin. She started riding the white horse hard, and after a few years of excessive cocain and heroine abuse, she woke up next to Brainy Smurf; lube and anal beads spread about the bed. To her horror she found herself pregnant and went into hiding, too ashamed of herself to leave her mushroom. She birthed the child, and left it in the center of town, praying to Smurf-God that Papa Smurf would care for and raise the child. He did, and the smurfs never thought twice about the mysterious appearance of the child, and Smurfette's 6 month sabbatical. She never looked at Brainy the same again, and never fully recovered from her cirppling addictions. She turned even more heavily to cocain to dull the pain of that fateful night, and, eventually birthed even more of the creatures, each an icon of humiliation and uncontrolled drug abuse. Eventually Smurfette had a final child, and Papa Smurf discovered her to be the mother. He made a deal with her not to exile her for her reckless self-endagnerment, and in return she must be an upstanding, clean smurf. She took his offer, and the baby was kept around to remind her of this deal. Or, as a shorter version, Smurfette had a wild coke party with half the town and got pregnant.