I feel kind of bad pointing out the missing information to a 12-year old, but since his letter was printed on Huffington Post I felt that some things should be clarified.
First of all, I feel bad that his sister was born with serious medical conditions, it's not something anyone really has any control over. The thing is, when the letter starts pointing out why his family lost coverage it shows the lack of information he has, either because his parents never explained it to him, or his parents (and most people I know for that matter) don't even realize or think about. The thing about using company policies is that you run the risk of losing coverage if you lose your job, thus putting yourself in the situation of having to find another insurance carrier that doesn't want to be put under the additional financial burden of dealing with pre-existing conditions (or didn't before the AHCA, but more on that later).
Companies have been using insurance benefits for years as a way to lure in potential employees, and it has gotten to the point that many people just expect the company they work for to include healthcare benefits as part of their pay (many would actually let you opt out in return for a slightly higher paycheck btw). Most people never even thought of the risk inherent in such a system if they were to lose their job or go find a better one for themselves elsewhere, having to go to a new carrier. What they COULD have done was purchase a private insurance policy. That would have cost them more money true, but it would also have given them the freedom of not feeling chained to a single company in order to retain coverage. Of course, as more and more government regulation got involved it also forced those payments upward to make it harder for individuals to pay for their own plans.
Because of the AHCA requiring insurance companies to cover people even if they have pre-existing conditions people have been watching their insurance premiums go up because the insurance companies now have to cover people for conditions that they have never paid in to have covered. And it's only going to get worse as people opt to not pay for insurance coverage for years until a condition appears or accident occurs since most small businesses do not employ the 50+ people requiring them under the law to provide health insurance. Also, due to the ever increasing coverage costs you're unlikely to see those same small businesses offering coverage for their employees even with the tax breaks they are provided because it still won't cover the majority of the increased cost. The AHCA also includes such stupidity as requiring all females in a household have birth control coverage on the plan, regardless of age or medical condition (pre-pubescent, menopause, etc) which increase costs even more, and it does not make allowances for an individual's religious beliefs.
For anyone wondering why I actually go to a place like HuffPo, it's useful for seeing what false or incomplete information the other side is pushing.