Hello
I appreciate your concern
Blood in urine is a matter of concern.
Since he is already a case of
prostate cancer and aged so in my opinion you shoud cancel the trip and visit emergency room immediately
Blood in urine might be related to inflammation or infection,
injury,stone or certain cancers of the urogenital tract.
He may require iron infusion or
blood transfusion in case if he has lost excess blood.
Please ask him to have plenty of fluids and immediately consult in a nearest emergency room for further investigation like Radiological study or an
ultrasound, urine test and PSA test to establish a diagnosis and accordingly treatment.
Hope this answers your question Please feel free to ask for more clarification I will be happy to help you
Best wishes