help! someone with will knowledge

my stepfather died a week ago. my sister was staying in his house when he died. she is 45 years old and had moved back home due to financial crap. my mother had a 20 year old will, that had named my brother who died in nov of last year as owner of everything, if he died my sister was next in line. my step dad had l00k llife insurance and now they are saying that it will go to my brothers estate first to his wife and then to my sister. so i assume it will be split 50-50. even though my brother is dead would this be true? this is what my sister is telling me from her attorney, i am not named in the will but she says it would be divided 33-33-33 between me, her and my sister-in-law. there are so many hokey things going on right now that sounds like two completely different things to me. i assumed when my brother died he dropped off of the will. he has no children. thank you anyone out there for some advice.