Fish oil...a good one, like from Nordic Naturals or Spectrum. It's a natural anti-inflammatory and it might just work better than the Remicade that is destroying his body....and liver....slowly. Take the fish oil, maybe 2 daily and increase it the days he has the pain. I'd also support the liver with milk thistle, but that's me.
Also, broccoli, cabbage and iceberg lettuce can be major culprits. I had a friend who would eat beans and THAT was what was setting her off. Most of my friends diagnosed with Crohn's have changed their diets and used PB8 and some used aloe vera as well to stop the reactions. One of my friends had an issue with JUST corn, but she had to stop corn syrup, corn meal, etc and has never had an issue. Another friend went back to his doc 3 years later and there was NO scarring in his intestines. His doc said that if he hadn't known better, he would have never known he had previously diagnosed him with Crohn's.
NOT to scare you, but rather inform you, a friend of mine was on it for 10 years and her liver couldn't handle it anymore. She ended up with liver cancer and died this past year at 37. Could have been more than the Remicade, of course, but make sure you know the warnings:
REMICADE IV WARNINGS
This medication can decrease your body's ability to fight an infection. This effect can lead to very serious (possibly fatal) infections (e.g., fungal infections, bacterial infections including tuberculosis).
The immune system is also important in preventing and controlling cancer. Though it is very unlikely to happen, there is a risk (especially in children/teens/young adults) of developing cancer (such as lymphoma, skin) due to this medication or due to your medical condition.
In patients using infliximab along with azathioprine or 6-mercaptopurine for the treatment of Crohn's disease, there have been rare reports of an extremely rare, often fatal cancer (hepatosplenic T-cell lymphoma).