teach your grandmother to suck eggs

grandmother | American Dictionary

grandmother
noun[ C ]
us/ˈɡrændˌmʌð·ər/(infmlgrandma, us/ˈɡræm·ə, ˈɡræm·ɑ, ˈɡrænd·mɑ/); (infmlgranny, us/ˈɡræn·i/)
the mother of a person’s father or mother

Examples of grandmother

grandmother
Four grandmothers are described as ' powerful ', ' very strong ', or ' very dominant ' women who, in many respects, led their families.
Factors associated with changes in visiting between grandmothers and grandchildren following an adult child's marriage breakdown.
Raising grandchildren : the experience of black and white grandmothers.
The qualitative data indicates that many grandmothers were ' on standby ', always ready to fulfil domestic tasks first before even considering leisure for themselves.
In taking a sometimes quite ' moral ' attitude to their own children's actions some grandmothers were indeed able to maintain close contact with sons' ex-partners.
I propose an epistemic strategy growing out of my grandmother's supremely rational advice.
In light of the fear of scepticism that externalists drill into us, we would be wise to listen to our grandmothers.
The majority of grandparents we interviewed were retired, or the grandmothers at least were no longer in paid employment.
There may therefore be a sharp fall in the future availability of grandmothers for the childcare economy.
One doesn't pay attention to the grandmothers and the old men, because they aren't dancing at all.
By contrast, there were a few aunts and grandmothers who played, usually temporarily, key caring roles, but to whom the child never became closely attached.
First, they were above all women, and among women, grandmothers.
I know of grandmothers who have to live in a back-garden shack.
Many grandmothers were comparatively fit and active, their median age being only 50 years.
Fewer grandmothers are willing to work full-time as baby-sitters and household managers.
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