You haven't gone wrong anywhere, certainly no more than the rest of us. We aren't perfect.
There is every point in carrying on, if only for the sake of your son and his children. And your son understands the situation and does not blame you for the estrangement at all, so don't keep blaming yourself.
I do hope your DD sees how hurtful this is for you and that you will be reconciled very soon.
Meanwhile, try to find something that makes you happier today. The sun is shining, the birds are singing. A walk in the fresh air can lift our spirits.
Sending you heartfelt good wishes. 
The Miracle Club: film recommendation
Why do restaurants and takeaways close so early now?
Do you think you know when you are going to die?
So it begins….. Streeting resigns
It’s been a while so I will start us off…….whats for supper and why?
