Hi Sir I have read your post completely your grandson is very mischievous of course he is your best friend and you love him so you tolerate everything from him. You have also rightly said that when you were at that age, you would have been very afraid of your parents and grandfather, but it has happened that your children are not afraid.Also, I read the next part of your post and it felt like I was on a journey with you.You have shared your points in a very excellent way.I felt like I was reading a novel. Well, you have written the best things about the time machine and the best use of it.