Link not working.
If you have enough digital info within the "son" then a straight Colour Correction may just win you through. But it does sound like you need to separate the Son from the BG.
OK, if you have a silo then you may very well have exposed for the background, and now, maybe you have lost the digital info amongst the "blacks" of your son. However, if you DO have enough dark digital info you could get somewhere by increasing the gamma of the "son" and solely the "son". But this you need to do selectively. You need to do this 'cos doing it to the whole plate would then loose you the BG. If the son is static-ish then that would be even better! So you need to:
1] Created 2 tracks: T1 called "Son"; T2 called Background. Actually you can call them whatever you like. Naming them here is purely to allow you to understand my approach! You could call them "Apples" and "Pears" . . .
2] Reduce the level or mute T2 to allow you to setup a MASK of the "son" in T1.
3] Go to the Son event on T1 and setup a Mask in Pan/Crop. Create a mask around the son and if need be adjust its position of the Mask over time to allow for any movement of the son.
3] To T1 Event or T1 Track Header apply either Levels or Colour Corrector or Colour Curves and "raise" the Gamma element of the Son Event or Track
It will be at this point you will discover IF you have enough digital info within the "blacks" to be satisfactory.
4] Now bring back T2 to a point where you have a better balance better "son" and BG
In Summary: Mask the Son; Apply Gamma or even GAIN to raise the Son from the Blacks; adjust both tracks for a better blend.
How about posting a snap/example of a frame in question?