Growing up is optional

Lizzie is Steve Rogers Granddaughter.
Like the rest of the world she is having to learn to live in a world without him. the different is they are thinking about him as an avenger, Captain America. she is thinking about the man that raised her, taught her about life.
luckily, she has his two best friends Bucky and Sam to help her along the way.
but will the world learn her secret?
and if they do what will happen?
What would happen if she developed feelings for a man who is more then old enough o be her grandfather.