I struggle to learn the Guitar and Sarah my wife is no less musically inept.
However both our daughters find it easy, so we have 2 violins, 2 tin whistles, 2 guitars (acoustic & electric), 1 flute, 1 trumpet, 1 cornet and a set of drums. They both can see a piece of music and play it straight off, they even rearrange tracks to suit the instruments, Hannah the Flutest and Kirsty the trumpet will decide which one plays an octave up or down so they work together. Even the music teacher at school asks Kirsty to rearrange the music so her trumpet fits in with the rest of the orchestra, they are 12 7& 11