Your son spoke some wise words...he's not waiting on his father to show up to hunt eggs...he's going to go ahead and do it and then show him what he got. Your son knows the score.
As for your MIL...I noticed that all she could say was practice makes perfect. She gives no encouragement at all. It's any wonder her children are screwed up.
I do hope that you and your son will enjoy your day. I'm sure he'll find all of the hidden eggs in record time.
Happy Easter!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.