Brother's Keeper explained
Brothers Keeper is an addition you can add to the Gold, Silver or Bronze plan.
With the Gold, Silver and Bronze plan your total coverage is $125,000 per medical event. If you want more coverage than Brother's Keeper is for you.
Brothers Keeper is a low cost addition which give you:
For the Gold plan: unlimited coverage amount per illness
For the Silver plan: an addition $100,000 per illness, per year, up to $1M
For the Bronze plan: an additional $100,000 per illness, per year, up to $1M
Additional cost is $20-$25 per quarter, per person (unit), up to 3 persons plus an annual membership fee of $40.00.
Final note on Brothers Keeper
$125,000 is a lot of money for a medical event! In most cases medical facilities give 40-70% discount if you are self-pay, especially non-profit hospitals and many other medical facilities.
Medical facilities boost up pricing because most people have insurance, and insurance companies only pay about 40% of what a medical facility bills. The rest is written off. Therefor regular pricing is jacked up big time and when you are self-pay they are happy to reduce your bill, big time!
So it's not unheard of that $250,000 of medical bills, are reduced to $125,000. In that case you are still within your covered amount without Brother's Keeper.
Personally I did select Brother's Keeper as it was an inexpensive option.