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First of all, you are legally entitled to the right to claim the children, because you are the custodial parent. So, your ex did not "give" you anything.
Second, even if he did give you the right to claim the kids on your tax return, that wouldn't stop you from seeking a child support modification. You can request a modification any time that there is a change in financial circumstances affecting the child(ren)'s best interests.
If you want to do it the inexpensive way, you can contact Mass. Dept. of Revenue, apply for services and they will take care of the rest.
Hope this helps.
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The Dept. of Revenue can only handle child support. If you seek an alimony/maintenance increase, you will have to hire a lawyer. For a family law attorney referral, see: http://www.abanet.org/legalservices/lris/directory/main.cfm?id=MA and www.martindale.com.
We seem to be having a bit of a communcation problem. I'll simply repeat my first answer, which is that if you seek to modify child support, then you can contact Mass. Dept. of Revenue, apply for services and they will take care of the rest.
Best of luck.