There is a fundamental difference when a "family member" is the same player. IRL a family member is an independent individual, and while cronyism exists, it does not compare at all to knowing that you are appointing the same actual person to a position. Therefore, OOC criticisms are inevitable and, to some extent, legitimate.
And all the more so if the character hasn't been role-played at all. If players want to use their family name as a reason to get ahead, that's perfectly reasonable, but they should at least be expected to role play using their family name to get ahead.
