How to kill a 9 year olds boredom. ...and solve an knot issue at the same time.. it's OK. ... the yarn is for his blanket that I am making. YES! A blanket.
Make sure you have lots of space to stretch out the yarn. Give child one end of the knotted yarn and shoe him how to make ball of yarn. Laugh a lot especially when he drops the yarn ball and it all unravels. It was a huge help and I was able to get back to my project.