My dearest Shosh,
It breaks my heart every time I think of your fingers and their mangled nails. Please stop. Nail biting is bad for you. See, e.g., http://www.huffingtonpost.com/2014/08/18/nail-biting-bad-for-you_n_5675467.html.
Remember when we used the awful tasting nail polish to stop your nail biting? Try that again if you must. If not, search the internet for ways to stop biting your nails and see what works for you. For example, wikihow has some suggestions, http://www.wikihow.com/Stop-Biting-Your-Nails.
Be well, my son. I love you guys with all my heart.
Always and forever,