Talking to your children, along with reading to them, is the best thing you can do to develop their language skills, which are a huge part of how they can develop reading comprehension skills themselves.
As well as developing vocabulary, talking to your children develops their understanding of syntax (how sentences are built), context (what words may mean in different situations) and inference (what something means, even if it is not explained explicitly).
Dyslexia Support and Assessment in Hampshire 