You could try both methods and figure out which one get more money back. Usually joint get more tax return.
2)還有, 我婆婆幫我們帶了一年寶寶, 報稅時可以加上她嗎? 具體該怎樣怎樣操作呢? 謝謝, 請過來人詳細指導一下,謝謝了!
Surely. She could be a eligible dependent. Please read the instruction of 1040.