Explaining Alzheimer's to Kids.
I am sorry to hear your mom has this problem. I hope she does well so do you.
There is many facets to this issue
1- keeping things at the children's level - for example for younger kids - "grandma is here to live and we are going to help her/ take care of her" depends on what wordage the kids and your self are comfortable with. "she is having memory problems" is probably the simplest explanation - and going up in complexity with the age of the child.
2- Then there is the concept of sharing the children's lives/ space and activities which will need to be addressed. Again at the children's level of understanding and ability to give care/ or engage in helping you.
3- If and when she does come live with you - I hope/ wonder if there is other family members (not children) you can draw upon to share caregiving for example on weekends/ or take her for a trip - something to decompress and give your self and family some time too.
Thanks and I hope this is a learning experience.