Now I am "Ganni" to seven I get what they meant, but will never say it. My “daughter-of-a-scientist" brain kicks in and I refuse to say something so illogical, even if my own father succumbed to this one. You cannot become a grandparent without first being a parent. There is no skipping. No "budging" in line. By definition, one precludes the other.
The mistakes, worries and agonizing in the first round are the price paid for round two. By then your love has grown muscles. You know some things are nothing to worry about. Your child grew out of terrified shrieks when you left the room, eating cat litter and creating mud pies from poop.
There are things you should have worried about and didn’t. You find these things out when they are grown. Conversations begin with “Remember when you and dad took that trip out to Colorado? Pause. Nervous looks. Giggles. “I can’t believe I’m telling you this...” These are the fun "confessions". They survived and are too old to be grounded. You are not shocked because it reminds you of something you did and never told them. They gasp, surprised you really were young once. You both laugh until you cry or snort stuff out of your nose.
And then there are the other talks. The ones that take effort to tell. You want to go back in time. Notice what you didn't see then. Keep her home that night, even if she yells and screams and threatens never to talk to you again. You would take that. If it meant you could have kept her from this.
At some point, after you knew you were going to be a parent, the enormity of that hit. You are going to raise a human being from scratch. You start with the basics...food, clothing, shelter. They cry. You hold, and jiggle, and sing until something works...your first confirmation maybe you can do this. You give up sleep, and loud love-making, and things you thought mattered but didn't. Your gift from them is seeing the world again. This time you know what to look for. But they find things you didn't know were there.
There are days you are not up to the job. You just aren’t. Feeling guilty about that makes it worse. If lucky, a grandparent comes to play with your child that day. You watch. And see this grandparent laugh and listen and hug your child. Your child laughs and hugs back. And in that moment you glimpse the power of love and life and family and continuation. You smile with them and the grandparent says what you need to hear. "You're a good mom.".
In time you understand your children are not yours. They may have your eyes and sound like you, but will not be you. The world doesn't need another you. It needs them. No matter how much you warn them and try to protect them, your children will refuse to be protected. There is no skipping over hurt and pain and mistakes. They cannot grow up without them. And that is the point of it all. Everyone gets to grow up.
I have seven grandchildren. I love them. Not more than I loved their parents. Just more wisely.
How much do I love my grandchildren? So much that when my grandson asked, “Ganni? Why are you an old woman?” I thought it was delightful.

Three of the six grandchildren. They are very loud.