Teddy;
First off; you are not alone in your puzzlement. Being a senior, I can attest to the deterioration of discipline among American children..and around the world, I presume. When it got to the point where you had to tell the boys the second time, where was Mama Bear or any other adult more closely connected with those children? She/they should have been right there saying, "Boys, Uncle Teddy said he is done, you had better listen!". Where was Daddy Bear..off drinking a Latte somewhere? He should have set them straight, if Mama reneged in her duties!
Unfortunately, we live in an age of PC..political correctness (i.e. Partially Conscious
), so your best bet for the time being is to let this blow over..because it could become very sticky if Mama Bear decided to b e difficult over a bruised arm or ego.
When I bred and competed with dogs, we used to call this malady "kennel blindness". Some folks thought their dogs were perfect and thus, superior to other "common" dogs. Unfortunately, children are not dogs; a bummer dog can be passed around until it eventually ends up in a shelter..to be euthanized. Children brought up that way often have a miserable life, because the big world out there is not "kennel blind" to little Johnnie's faults and won't put up with them. His friends (if he has any), will simply be "users", preying upon his desperation or loneliness.
The greatest child-rearing book ever written (the Bible) says; "He who spares his rod hates his son, But he who loves him disciplines him promptly" (Proverbs 13:24 NKJV)
You framed your question wrongly..in today's culture, we cannot consider disciplining other's children...and that is exactly why there is so much lawlessness in our nation today. If the parent doesn't provide discipline, the child will not know it until he/she ends up in the disciplinary system (prison).
I would shy away from any real contact with these children; then...if in the future, the parent asks..that is your opening to explain (politely) just how the child is being prepared for failure.