Potter Twins

What would happen when instead of one child being born to Lily and James Potter but twins instead with the eldest Potter child hiding the young one, until they were born. However what would happen when the youngest Potter child remembers everything from his past life because of something that caused the young ones death, so what happens when the youngest Potter uses his knowledge against the one who was truly in the wrong? Will Harry take his little brother's words for granted or will he follow his little brother's knowledge and help him with whatever he needs done, but here's the kicker the youngest doesn't remember all this until they are almost killed during the second year.

Read to find out what really happens in this little tale and yes there will be boyXboy in this story so if you don't like then don't read.