From another angle, I have been doing Aikido for over 25 years, and did Judo before that. In 2002, when my kid was about 2, he had a plastic sword and came at me with it while I was practising outside. Of course, I did not want to clobber him with my bokken, but he managed to hit me several times in a random kind of way. Since that moment I realised that my bokken training was useless. As as result of that, I took the bokken patterns to pieces and tried teaching/practising the basic parts with my students in Korea - with the aim of creating something more freestyle or realistic. I have no idea if what I am working with works since there is no ready battlefield nearby to test it, but it has been a lot of fun. The name I have adopted for my new creation is Assault and Battery
But it is not really freestyle, rather, an attempt to reach freesyle.
My kid is my teacher!