It is a very emotional issue with grandkids involved, isn't it?
When my granddaughter was born, I did everything possible to get custody of her for 5 years, short of hiring a high-priced attorney, which I did not have the money for.
When my grandson came along, I was exhausted in every sense of the word.
Their father did eventually win custody after the divorce, but he's had zero backbone in regards to doing what's best for the kids.
Now my 15 year old granddaughter lives with her mother. Ugh.