Playdo have him roll little balls, then squash them with each finger. Have him roll out long cords of dough and then give him a toy knife to slice them.
If you give him a peeled banana, give him a toy knife and then have him slice it them have him use his fork to stab them and dunk them in yogurt.
Give him clothes pins and have him help you carry clothes with the clothes pins from the dryer to the laundry basket.. Make it a game..
Have him help you put your change in the family piggy bank. One piece at a time.
Small toy cars can be used to follow the "road" that you and him have drawn on a piece of paper.. Make the road larger and larger by collecting the papers and let him tape the papers together. Then he can push his car along the lines.. Make it a game, push with one finger, then 2. Try the other hand.. Show that even you have to struggle, but that is ok.. use YOUR words...
For snack try to include as many finger foods as possible and have him pick up each piece one at a time. Let him feed you "1 raisin" then
"2 goldfish, one at a time".
Get some sugar or peanut butter cookie dough and have him help you push it flat, one ball at a time, then let him use plastic cookie cutters to cut them out... Then you can bake them.
Have him help you try to button dads shirts so you can put them on the hanger.
Also set an example about frustration. Pretend to have trouble, doing a task in front of him and let him hear you say "This is frustrating." "I think I need help with this." then ask him for his assistance "Could you please help me. "
"Thank you " "Thank you for your help." You and your husband should also say these things with each other in front of him.
I wish I had this information for our daughter. In kinder this is the one thing I had not really worked on very much.. After working with her a few days she quickly developed these skills. At the age of five I had her make chains of paperclips, I had her collect all of the rubber bands and make rubber band balls. I had her help me ball and then tie ribbons on all of my husbands socks,, Should have seen his face the next morning.. Hee, hee.. I also hade her help me cut paper and ribbon for projects...