My wife really wants her parents to come to the US on a B2 visa from the Philippines, so she found some local agencies there that claim to help people get their B2 visa with preparing them for the interview.
I already filled out all the paperwork and booked them OFC/Consulate appointments, but I'm skeptical if using an agency is even worth it at this point.
Few notes:
My father-in-law has one complication that in the 1980s, his employer filed his Taiwan immigration paperwork incorrectly and all of the workers got arrested sent back to the Philippines from Taiwan. Not sure if this is considered a deportation, since they never went in front of a judge and no further action was taken, but I noted/explained this situation in his DS-160 and I imagine he will get asked about it during the interview.
They don't have great financial means, which I know is always a challenge. I'm going to provide an invitation letter and confirmation of funding their trip, in case the interviewer wants evidence.
For ties to the Philippines, I was going to recommend them bring their land titles, picture of their house, motorcycle title, and evidence of taking care of our niece and my grandparents-in-law.
For visiting the US, I was going to tell them to talk about visiting my wife and I, but also suggest different touristy things we could do/