You do not have to wait for them to amend. That will not help you. The children's SSN's are already the system.
Prepare your own return claiming the children who were with you for more than half the year and mail your return. Mailed returns are processed differently, so go ahead and claim the children. Print, sign and date you return in ink.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
Your sister and her spouse still need to amend---you just do not have to wait for that.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
