My former spouse asks if he can claim my child as his dependent and ask me to sign the tax waiver for 2012. My child lives primarily with me and he has weekend visitation but shared legal custody. Our current custody order does Not include an agreement on who claims our child for taxes. ( I am currently unemployes) lf I nicely sign over my right to claim my child for taxes for 2012 only, will this set precedence as allowing him to claim child dependency and tax rights for the future and use as evidence in court to modify child support and visitation order? Thank you.