Well this concerns me my friend, first you are giving them breakfast too early. Wait one hour after the blackseed oil and then give them breakfast. If they are not eating and have reflux, I strongly suggest that you try real hard to get some raw honey. All diseases come from the stomach and if they have stomach problems then honey, honey, honey. Our prophet told us that the cure for all diseases lie in two things. One is black seed and the other one is honey.
So what I would do is switch from using juice to raw honey. Especially if there is an appetite problem. Wait one hour and then let them have breakfast of fruit. Fruit should be everyone's breakfast. Make sure you feed them fruit in the right combinations. Such as no sweet fruits with citrus. You can google for food combination charts.
Now I want to check but for immune problems we use olive leaf and I mean fresh olive leaf. Now for the 6 year old you can give him capsules (vegetarian). But I am so sleepy right now, as I have been up all night answering the forums, but hopefully tomorrow I can get you an answer on that. You need to build up their immune defense.
Now ear infections. I just had a real bad one and what you do is rub some of the oil on the temple, on the area in front of the ear and behind the ear and put a tiny bit inside the ear and it should clear up in a few days.
I did check on your oil and I approve of the company and have added it to my list of acceptable companies.