Enjoy the time you have cutting with your son.
My boys still talk about our wood cutting forays. Some days, we spent the entire day working. Others, we intended to work but ended up working a few hours and spending the rest of the day shooting .22's, bows or just cooking up some backstrap, from a recent deer hunt, and sitting around discussing life.
They're grown with their own families now and have moved away.
I really miss those days, they were special.
I'm now a one man band and even though I love being in the woods and running my saws, there's something missing, that is gone forever.
Enjoy the time with your son, those are days that will define the man he becomes.