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Wiz Khalifa has challenged Amer Rose her over full custody of their one-year-old son, Sebastian.  Wiz just filed his response to Amber's divorce petition, asking for joint custody of Sebastian. He stated, “fact is  in California it's advantage Wiz because there is a presumption joint custody is in the best interests of a child ... and when a parent asks for sole custody it's often a sign of vengeance.


Amber is the one who demanded a prenup and she's getting a lump sum payment north of $1 million.


According to the docs, filed by disso queen Laura Wasser, Wiz is also willing to pay Amber spousal support, because we now know the prenup provides that. Sources connected with Wiz and Amber tell us the agreement gives her upwards of $5K a month.