Hi
@llr , welcome to the forum.
I'm sorry to hear about the kidney problems of you and your family.
Maybe you'd like to start a new thread about it because it's a different question from the one asked in this thread?
Metformin shouldn't affect the kidneys, but in people with kidney disease caution is recommended in using metformin, which is likely why all of you have been taken off metformin after developing kidney issues.
A very common cause for kidney disease is high blood glucose though, and you all have diabetes.
Do you know what your hba1c is?
If it has been on the high side for a long time, that's a much more likely cause of kidney failure than using metformin.