I would switch to an electric razor. Much safer anyway. Once he is done with his shower and is dried off you could try shaving him then the hair will be softer and easier to shave. You could even give him the electric razor and let him try shaving himself. (If he is still able to do this) If you want to use a regular razor, not an electric I think it is Gillette that has a "Caregivers razor" it is angled in such a way that it makes shaving someone else easier and safer. (Gillette TREO caregiver razor...quick Google search)
I had to shave my husband for the last 22 months of his life and I used just a regular "Gillette" type razor to shave his face and under his chin area, and a rechargeable beard trimmer to trim his guotie and mustache. If you pull the skin kind of taut on his face it makes it easier to shave him with the regular razor. Good luck!
Once he is done with his shower and is dried off you could try shaving him then the hair will be softer and easier to shave.
You could even give him the electric razor and let him try shaving himself. (If he is still able to do this)
If you want to use a regular razor, not an electric I think it is Gillette that has a "Caregivers razor" it is angled in such a way that it makes shaving someone else easier and safer. (Gillette TREO caregiver razor...quick Google search)
If you pull the skin kind of taut on his face it makes it easier to shave him with the regular razor.
Good luck!