When you have three imperfect people deciding someone's fate based on how repentant (and how that manifests itself in individual people) of course things like a nepotism or familiarity with the family will effect the outcome. We all know judicial meetings are not infallible- there's been so many horribly botched up ones.
I personally managed to stay on the fringes of the religion for many years because of nepotism. There also exists alot of elitism and classism in congregations. Alot of upper middle class baptized JWs that I know went to college and married non-jws without too much drama from elders.
The idea that JWs are this type of perfect utopian society on earth where everything is just and fair is so far from reality. It's just like everywhere else- it's all about who you know and your connections.