No one should be able to pardon anyone with even the slightest relation to himself or his/her actions in the past. I have no idea why this is even a discussion.
The pardon power as is it today is a travesty. A president could possibly pardon someone who killed his political opponent and people could do nothing about it other than being "concerned".
This unchecked pardon power has no place in a country which claims to exist under the rule of law.