Thanks for your query,based on the facts that you have posted it appears that your father has cancer of the bladder involving both the ureteric orifices resulting in to blockage of draining urine in to bladder.His both the kidneys are drained by PCN tubes which will help him to build up his general condition to plan a major surgery in near future.
You have done his bladder biopsy
which could not conclude the nature of pathology
( Cancer) However since treatment of bladder cancer
depends upon the stage of the disease he needs to repeat biopsy of the bladder to confirm the tissue diagnosis and the stage of the disease.
Please consult qualified Uro -Oncologist
for evaluation and further treatment.