Doting means showing excessive fondness. A doting father, doting grandparents, doting on her.
The excess is built in, and the word is affectionate about it — a doting parent is indulgent rather than wrong. It takes on. Note dotage, meaning the feebleness of old age, which comes from the same verb; and that dote originally meant to be foolish or in your second childhood.
1adjectivedotingShowing excessive fondness.
“Her doting grandfather bought her everything she asked for.”
doting is a quality of fondness.
Dote plus -ing, from Middle English doten, to be foolish. Dotage comes from the same foolishness.
Middle English
dotynge
English, today
doting
From Middle English dotynge; equivalent to dote + -ing.
Etymology from Wiktionary, CC BY-SA