From the picture,i can see the wound has healed to some extent. Continue Sliverex oinment open dressing for one more week and your father in law is good to go.
Since silverex is also a topical antibiotic you dont need any other antibiotics. If your father in law prefers closed dressing you may go with Bactrigas dressing.
Next Steps
Continue sliverex for one more week.
Health Tips
Remember burn injuries are slow in their heaLing process