Smash it against the ground and presto, its open
Try tapping the side of the lid (gently but firmly) on the counter and then try to open it. This has always worked for me but some jars are really stubborn.
well you are in a pickle aren't you.....yeah it works - hit HARDER....eventually if nothing else the jar will break.....pickles' will be a little EXTRA crunchy though......jam a steak knife through the top......
at the risk of being hit with a pickle jar: for years i used a table knife to "shock" it loose by hitting the top edge of the lid glancing blows in the direction you're turning it -- blows strong enough to leave marks/dents. hubby brought me home a gadget to use in his absence, though, which i now use. it's sort of a giant plier that grips the lids and the long handles make it easy to turn. you might look for something like this to "replace" your brother.
Warm water on the top of the jar will help.
Knock the lid on a table or something, then try again.
Not that I know of. Try running the lid under hot water. Be careful if the jar has been in the fridge though, start with cold water then increase the temp so you don't crack the glass.