Tasinei

Hello! So I am planning the family vacation this year and I thought a Caribbean cruise might be interesting. However, my brother is unable to enter the USA due to his criminal record. Can he still go on the cruise or do I need to figure something else out? Or maybe he can get on in another port? Or am I looking at having to pick another location altogether maybe? None of us have ever been on a cruise before. Can't seem to find any info on this, he has a valid Canadian passport for some context.