It sounds like you're on the anti-
MAP antibiotic course. The behind it is that Crohn's might be caused by Mycobacteria Avium Paratuberclosis since it causes similar diseases in other animals and if you kill it, the Crohn's might go away. If works you flat out wouldn't have Crohn's anymore, but I'd still feel safer on drugs to maintain
remission (it is VERY easy to contract MAP since it survives cooking, pasteurization, and can't be easily removed from the water supply)
And no, if it doesn't work, it's not likely to start working, especially because the body may have developed antibodies since you stopped. If the antibiotics don't work and your family is really committed to cutting edge treatment there is
Vedolizumab which is almost certainly not going to be covered by any insurance and maybe difficult to obtain in the USA. There's also
Cimzia which would likely be easier to get, though neither of these is likely to be covered by insurance and cost incredible amounts of money out of pocket.
