It is not clear exactly what you are searching for but "specifically to Wilhelm" makes no sense at all. Victoria's father was Edward. mother Victoria, her husband was Albert and her four sons, Edward, Leopold, Alfred and Arthur - so who is Wilhelm supposed to be? My feeling is that you are dealing wwith a "family story" - but details of all Victoria's children, grandchildren etc are well documented so it would be very easy to find exactly where you think this relationship was.