As the question has a 1:n relation with Answer, you can fetch with a prefetch path the question AND the answers in one call, so you then get a QuestionEntity instance with its Answers collection filled with the Answer entities related to that question, similar to Customer and its Order entities.
As for nested repeaters, you could have a look at HnD, its Start page (the section + forum page): http://www.llblgen.com/hnd
It's the sourcecode of this forum system. The source is for LLBLGen Pro v2.0 (not updated yet for v2.5, we will do that shortly), though it will show you how to do nested repeaters and databinding.