Bless your heart Donna, you have your hands full.

Under normal conditions, for preventative measures, one to four teaspoons per day is a good dose.  However, with these illnesses, I would increase it by quite a bit.  You cannot overdose.  The silver will be stored in the tissues to prevent against further infection.  So.... with both your sons, triple the dose. 

For the earache, use the silver as eardrops.  It will clear the infection up. 

Continue what you are doing with the ethinacea, vitamin C, lots of fluids and I am going to post the remedies from Tony's Collected Home and Herbal Remedies.

Tony adds: There is really no such thing as too much of true colloidal silver and tougher illnesses need larger amounts. My suggestion would be one to two ounces a day.  There has been a bug lately that nothing seems to stop - and there is some evidence that it may come from chemtrails, in which case it would be more of a poison that a pathogen.

Ear ache or infection

• For maximum effectiveness add a few drops of colloidal silver to any of the following, or use it by itself (warmed for comfort):
• ase the pain and pressure of an ear infection with a store-bought blend of mullein (Verbascum densiflorum) and garlic (Allium sativum) infused oils. These oils kill pain and fight bacteria. Before bed, warm the drops. One way to do that is by placing the bottle in your armpit for 45 seconds. Tilt your head and squeeze 5 drops into the infected ear and then place a cotton ball in your ear for a few minutes to keep the drops from running out. You should experience immediate relief.
• Make garlic oil: chop one to two bulbs of fresh garlic. Place the garlic in a double boiler, and cover with an inch of olive oil. Cover the pot, and warm the oil gently over low heat for one hour. Strain the oil through a piece of cheesecloth, and store it in a covered glass jar in the refrigerator. To use the garlic oil, place a small amount in a metal spoon and heat it gently over a flame until warm. Suction the oil up into an ear dropper, place a couple of drops into each ear canal, and plug the canal with a soft cotton ball. Repeat this every hour or as needed. Do not use garlic oil to treat an external ear infection or if you suspect a punctured eardrum.
• Garlic, Apple Cider Vinegar, Honey, Eye Dropper, Warm Towel or Pad. Cut two to three cloves of garlic(fresh)into a bowl. Slice it in half real good so the juice comes out. Pour in about a teaspoon and a half of vinegar and melt in a little honey, not a lot(can heat it up warm if you prefer). Get an eye dropper and make sure you stir the substance up real good. Take that eye dropper and suck up a little solution at a time and put it in the ear. Let it sit for about a few seconds and drain it out. After draining it a few times the ear should draw out and reduce the pain. Add a warm to mildly hot pad or towel.
• Another garlic oil remedy is to take garlic gel capsules and pierce the capsules to squeeze 4-6 drops in each ear.  Garlic has a natural antibody called allicin. Repeat two to three times daily.  Also take some of the capsules orally. You should see marked improvement in two to three hours and near complete resolution in 24 hours.
• Cut an onion in half. Take the outer layer of 1 to 2 of the onion and put it over a flame and then put enough oil inside this outer layer to wet a cotton ball. Put this cotton ball in the ear once or twice for one day. (from Mexico)
• Bengay, Cotton Swabs Remedy - Take a cotton swab and smear a small amount of Bengay on it and stick it in the aching ear. (get the odorless kind, it just smells better) Change to a new swab of it every 15-20 minutes. This remedy works well and is an instant pain killer.
• Extract one teaspoon juice from mango leaves. Slightly warm and use as ear drops for ear infection.
• For a person who has had (ever) a perforated or punctured eardrum, follow the above procedures without adding drops inside the ear canal to achieve much of the healing and pain relief.
• People that get a lot of ear infections might actually be allergic to dairy products, egg whites, wheat, peanuts or soy. Or, their intake of fatty foods may be too high.

Common Cold Remedies

Congestion:

Instructions: Boil all the ingredients in the 5 cups of water till it turns brown and have a hot cup of this mixture every hour to relieve congestion. (From India)

Instructions: Mix together and store in small bottle. Take three teaspoons whenever needed.

Fever

• Maintaining your fever, rather than breaking it right away, can fight the virus that's making you sick. If you have a mild fever (up to 100 degrees), wrap yourself in a blanket and drink a cup of yarrow tea (Achillea millefolium). Make the tea by steeping two yarrow tea bags or two teaspoons dried yarrow in one cup boiling hot water for 15 minutes. Reheat it until it's piping hot, and sip it slowly. Your temperature may rise or fall a degree as you start to sweat. If your starting temperature is 101 to 103, drink the tea but skip the blanket. Check your temperature every 30 minutes throughout this process. Eventually your temperature should drop. If your starting temperature is 104 or more, or if the tea-drinking brings your temperature to 104 or more, call your doctor, preferably one who is also trained as a naturopathic doctor. Don't do this with babies or children, or if you're pregnant; consult your doctor, preferably one who is also trained as a naturopathic doctor instead.
• Dry powdered Jell-O, crushed ice.  When children or even adults get the flu and fever, one of the most important things is to keep fluids in the system. Many times a fever will create nausea and no matter what goes in the stomach, it always seems to come back up, with dry heaves or vomiting.  Try this old family remedy. Take some dry powdered Jell-O mix (any flavor) and put it in a mug of crushed ice, Toss it around in the mug, so the powdered Jell-O is all wet from the ice.  Then give the mug and a spoon to the patient with the fever and flu. Let them chew the ice and suck on it at their own pace. The dry Jell-O coagulates in the stomach and helps keep the fluids in.  It also helps keep the patient from vomiting and having dry heaves. Simple and effective.
• A large onion (cut in half) and two ace bandages.  Using the bandages, tie a half of onion to the bottom of each bare foot. Reported to work every time.  From down south.
• Tomatoes and vinegar.   Put the vinegar in a plate. Cut tomatoes in slices. Mix in the vinegar and soak for a few minutes.   Put the tomatoes on the bottom of the feet immediately and then put on socks.