It's like saying that because my grannie smoked until she was 90 smoking isn't bad for you.
From the guardian.co.uk
You can also get flannel grannie gowns, two-piece pajamas, socks, dresses, shirts and caps.
From the freep.com
My grannie apparently wanted to apply a spider's web to my bleeding knee after I'd had a fall.
From the newscientist.com
My horrified mother pushed my grannie aside and instead used alcohol, which stung, and mercurochrome.
From the newscientist.com
Grannie died in the April of the same year.
From the telegraph.co.uk
My old Scottish grannie was one of them.
From the thisismoney.co.uk
Gran, grandma, grannie all seem so old.
From the eadt.co.uk
The days when women stayed at home and looked after the children and the husband, until the children have moved out and grannie has moved in are long gone.
From the guardian.co.uk
The other plus to being a grannie is that research has shown that families with strong grandparental connections are likely to have more stable children.
From the independent.co.uk
More examples
Grandma: the mother of your father or mother
Grandparents are the father or mother of a person's own father and/or mother. Everyone who is not a chimera has a maximum of four genetic grandparents, eight genetic great-grandparents, sixteen genetic great-great-grandparents, etc. ...