My Brother's Who?

Elise is a 15 year old orphan who has never known her last name and has been in a orphanage since she was 5.
When she finds out that she has a brother and he wants her to come and live with him, her whole world changes.
Adam Dahlburg, a 20 year old youtuber going by the name SkydoesMinecraft, finds out he has a sister for 15 years and he never knew.
Neither one knew about their long lost sibling.
So when Elise finally finds out who it is, She realises that she won't just be your average fangirl anymore.
Because after all... Her brother's who?