How do we get an affadavit of support if my husband does not have a job?

You cannot use his income to qualify for the affidavit of support, as he has none in the US. You will need a joint sponsor.

As long as you have a sponsor whose income is sufficient to sign the affidavit of support on behalf of your fiancee and then husband and his son, then there will be no negative impact on their ability to get a visa to the US or a green card once they are in the US.

Your future husband does not need to have a job or assets of his own. You, the petitioner, are the one who has to do the affidavit of support regardless of how much money you make. If you go the fiance visa route, you will have to do 2 types of affidavits of support: the I-134 when he applies for the K-1 fiance visa, and the I-864, after he comes to the U.S. when he applies for adjustment of status (green card). Not knowing more about your case, my sense is that you might be better off marrying him and going the immigrant visa route because then you would just be doing the I-864 and, because your income is not sufficient, you could get someone to be a joint sponsor. There is more control with the I-864 done in this country with the National Visa Center in N.H. I don't know which country you are in but some of the U.S. Consulates are difficult to deal with and at the K-1 stage it seems to me it is better not to have to dotwo I-134s. If you marry your fiance inhis country, be sure to getthe official certified civil marriage certificate. Then you will come back and file an I-130 petition for him with CIS (Immigration). After the I-130 is approved, it will go to the NVC (State Department).You will have to do a separate I-130 for his son but you have to get married before he turns 18. If that seems like too much initialexpense to you, of course you can try for the K-1 visa; his son would be a K-2 and could be included even if he is over 18 (but only until he is 20). But remember that once they both entered the U.S., they would have to do separate adjustment of status applications, so that is an additional large expense later on, whereas if they both enter with immigrant visas, they're done the green cards come in the mail a few weeks later.

You can always get someone else to also sign an affidavit of support. He can be petitioned even though he does not have a job as long as he is not a possible public charge.