To be/take someone under one's wing phrase informal
To be guarded, tutored, fostered, or cared for by one.
Since Jack's parents died, he has been under my grandmother's wing.
I arrived here a few days ago, as an illegal immigrant. Luckily, I was under Linda's wing.
Max's an orphan child, so I took him under my wing.
The verb "be/take" should be conjugated according to its tense.