Here goes the PSD.
You'll see the adjustments layers. At first I used the hue and saturation to desaturate the image but it wasn't like the reference (mostly the glasses were too bright). So I used the black&white with a red filter. The Hue&Saturation is still there to add a little bit of a blue tint on the boy pic and a little bit of yellow on the girl.
I also added a "cheat" layer to get that all black background. Some items were still visible... no much but barely.
Glad I could help ! You can tell the wife you did it by the way
