Welcome to e health forum.
From the description provided it seems that your father, might have suffered a recurrence of a stroke.
The LS spine MRI - has shown age related degenerative spinal disease causing pressure symptoms on the lumbosacral plexus, which might have affected his control on his bowel and bladder. This is probably the reason he has bowel and bladder incontinence.
The CT of the brain, has detected multiple smaller strokes , which could be due to either recurrence of strokes or older strokes.
First and foremost, your father will need hospitalization for a few days, so that he can receive proper care and treatment. Consultation with his neurologist would help to optimise his treatment of underlying conditions like hypertension, diabetes, etc.
The severity of impingement on the Lumbosacral nerve plexus also needs to be assessed, to check if he needs any surgical decompression of the nerves.
Additional information can be provided by your doctor, based on his current status and physical examination findings.
Regards.
Dr Anvekar.