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我哥嫂是绿卡，申请他们的成年未婚28岁的女儿移民来美。嫂子是主申请人。现在移民局要求补充材料关于i-864表格。嫂子填i-864作为petitioner 也是sponsor, 因为身体原因，没有工作，没收入来源，所以需要她丈夫作为家庭成员，经济收入作担保填写i-864a, 问题是她丈夫（我哥）的收入太少，现在又要我加入作担保人填i-864.

问题1，我是属于哪类sponsor? The only joint sponsor, or the first of two joint sponsors or the second of two joint sponsors?

-You are "the only joint sponsor". Your brother is not joint sponsor, but household member. By the way, your income has to be enough to cover your brother's child (not include your brother's).

问题2，part6中 19a-19c 栏如何填写？是填1040表上的adjusted gross income 么？但是表格上说的似乎是my  total income as reported on federal income tax return.
-The follwoing is cited at this website:

http://www.nolo.com/legal-encyclopedia/free-books/fiance-marriage-visa-book/chapter8-5.html

Questions 18−19c.: For persons who filed federal income tax returns as single, the numbers USCIS is looking for in the “total income” boxes in 19.a., 19b., and 19.c. can be found on line 22 of IRS Form 1040, line 15 of IRS Form 1040A, line 3 (“adjusted gross income”) of Form 1040EZ, or line 23 (“total effectively connected income”) of IRS Form 1040NR . Persons who filed as married will have to determine how much of the number on those lines is attributable to their own personal income.