My five year old daughter does the same thing so I set her up with a vise, anytime I sit down to tie she comes and joins me. it is not important that she makes good flies at this point, it is time spent...she picks what she wants to put on the hook. pink is very popular! i dont criticize just watch. you will be amazed at how fast they will pick things up, she now can wrap thread like a champ and is getting better at attatching what she wants on the hook...i guess my point is let them tie when they want. when he gets older girls, cars and friends will take over.
gary

ps anyone have a flyrod for a 5 year old girl will be needed by spring...(yyyeeessss)