Becoming The 'Twins-who-Lived'

Rose Evans-Potter has spent her all life in US without knowing she has a brother in Britain.....a twin brother.....She was well aware of her magical powers and became a well known magical fighter America has ever seen....When threat of Voldemort becomes known to Order her help is requested and she and her team set off to help the Order....
Harry after overhearing the name Rose was shocked at the familiarity and the unknown sadness that washes over him...
Will the bond of the siblings hidden by others and separated by distance ever be same again??? Will the 'Boy-who-Lived' and 'Girl-who-Lived' ever become the 'Twins-who-Lived'??? If yes, what's the fate awaiting them? And how will the fate of others especially Rose's family and friends in America change?? Will this union and togetherness be a blessing or a disastrous curse for the magical world??
But the most important question - Why was Rose hidden for so long???
Stay tuned to find out these unsolved mysteries, answers to these questions and the fate of the magical world which now has another shoulder to support and decide other than Harry Potter