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if wife has J1 visa and husband has a J2 visa who should file form 8843 for child and if both have W-2 should file as non-resident 1040-NR each separately and J1 visa should 8843 for J2 visa or J2 visa can file 8843 by himself and J1 file 8843 for herself. 

I was wondering if husband has other income like online shop as self-employed (beside W-2 ) where should enter on 1040-NR?

should file Sch C but no pay SE tax also? If so, what part of Sc C indicates to exempt of SE for a non-resident. no treaty tax included on visa. Please answer this question

I am not talking form 8812@pk, asking about form 8843 . Could you please read again my question!.

Apparently Brazil does not have totalization agreement with the U.S.