Probiotics should do no harm, but it's hugely unlikely they will induce remission and heal his colon.
I feel bad for your father, who has to face a surgery decision before he's even had time to adjust to the UC diagnosis. He does indeed have a risk of rupture, which would make the surgery an emergency. Emergency surgery is riskier, and the spilling of bowel contents into the abdomen can produce a massive infection. Hopefully the Remi will work for him.
You're wise enough to know that this is his decision to make. All you can do is support him and provide information. To that end, you may want to visit the ostomy board here at HealingWell.
Your father is fortunate to have your support and understanding.
Moderate to severe left-sided UC diagnosed 2001.
Flared for 5 years, finally in remission with Remicade since March 2006.
Avascular necrosis in both shoulders is my "forever" gift from steroids.
Colazal, Remicade, Nature's Way Primadophilus Reuteri.
"My life is an ongoing medical adventure"