OMG... yup, I can totally see that happening... no aim and that little space between the toilet rim and the seat... yup yup...
With my brother, cousins, nephews, and mine our family always does the standing thing... even if it means peeing on a tree in your fenced/private back yard to get the ball rolling... cheerios/fruit loops are handy too.... "You sank my battleship"... oy I remember my lil' brother being so thrilled with himself over that one...
Really, boys peeing is dad's job... and it doesn't take all that much instruction... but dad really does need to take the time... just next time it's time take your little buddy in there... just SEEING what it is that you're poda do with that thing... from someone who has one... all the difference.
Best of luck!!