Your wife's father can be a joint sponsor along with your wife but you cannot enter on the B1/B2 Visa if you intend to apply for residency. That is considered immigration fraud since the B1/B2 Visa is for tourists who intend to return home. Your wife needs to petition for you with an I-130 and have a U.S. address. The process will take about 6-8 months.
Andre Olivie, Esq.
Legal disclaimer: This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. Do not rely on this advice without speaking to an immigration attorney in detail about your case. This message does not create an attorney-client relationship.
Yes, he can be the joint sponsor for affidavit of support purposes.
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Law Office of Luis A. Guerra (954) 434-5800. This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice.
There may be other requirements for your U.S. Citizen Wife, so the situation can become complicated very fast unless the consular official has patiences. Many have a limited amount of time to explain that your wife should make efforts or plans to work, upon her return, as well.
The process can get confusing in that minor indiscretions can lead to bars on immigration. This is why I strongly recommend that you consider hiring a competent and experienced attorney, so that you may better avoid these situations.
This is general information, not legal advice, and does not create an attorney client relationship.