Fashionistas: Date the Look

I have recently found some old family photos and I don't know a soul. The ultimate goal of course will be to identify the people in the pictures. Unfortunately I'm not even sure what years most of the pictures were taken. So I ask for my costume and fashionista friends to enlighten me what time period these fashions were, well, in fashion.

What style are the girls wearing?

Unknown woman from an unknown era

The boys in what decade?

My grands, guess the year