I need an idea for a story. Do u have any ideas?

you could have a brother and sister who when they turn 16 realize that they have these special abilities and then they find out that the government are trying to capture them and stuff like that. and then they get this ordinary girl to come and help them and then she realizes she is really special and can be the only one to help them and along the way she could fall in love with the brother!! just an idea!