Them being related is definitely something that the script writers/Lucas didn't think of until midway through filming ROTJ.
He talks about it in one of the interviews from the remastered VHS collection. During the fight on the second death star, the script just said "Luke gets angry" and he couldn't figure out how to flesh that out until he came up with threatening Leia.
Oh damn, why haven't I watched these movies with commentary before!?
Them being related is definitely something that the script writers/Lucas didn't think of until midway through filming ROTJ.
He talks about it in one of the interviews from the remastered VHS collection. During the fight on the second death star, the script just said "Luke gets angry" and he couldn't figure out how to flesh that out until he came up with threatening Leia.
Oh damn, why haven't I watched these movies with commentary before!?