Yes, you can deduct the 30% rent you pay since the 1099-MISC form shows 100% of the income your husband earned not the 70% he actually received.
For additional information, see What self-employed expenses can I deduct? and
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no - because you technically never received the money to begin with, so you already have the benefit.
if the rent was not netted from the 1099 (meaning the 1099 was a higher dollar figure) than you could, but it gets you back to the same place.
@HelenC12 - can you please go back and read the question again and reconfirm your response.... the 30% comes out BEFORE the husband is paid, which I read as :
1099 shows $70
you CAN NOT deduct the $30 a second time.