NuStock and a toddler t-shirt. (you may want to get some runner gloves too. NuStock STINKS)
I don't see why the combo of oils would be bad, but they do the same thing, so I would just stick with the fish oil.
Also, adding Apple Cider Vinegar with the mother, and/or bovine colostrum into their diet would help boost the immune system to fight the Demodex.
There comes a time in your life, when you walk away from all the drama and people who create it. You surround yourself with people who make you laugh. Forget the bad, and focus on the good. Love the people who treat you right, pray for the ones who don't. Life is too short to be anything but happy. Falling down is a part of life, getting back up is living.