flush & straights

yes, now i know what these are...the boys - all 4 - decided to teach me how to play texas hold'em poker last night and as so predicted they bugged me ALL morning to play another hand with them...is this illegal? is betting your entire allowance that you have yet to receive a value i really want to teach them (just jokin') no money involved YET...i prefer to look at this as a good lesson in statistics...back to dealin'....