Afraid of Breaking Family Apart

How would I handle this situation without causing irreparable harm to my family's relationships?  I have an adult child who is married and has a 2 year old son, my grandson. Both he and his wife work long hours, not necessarily needed but more of a desire on the mothers part. The child is almost always with a sitter, sometimes until 10pm unless I get him on my days off so he can be with family and also so I can spend time with him. More times than not, when we have family functions and holidays and gatherings, both parents have to work and can't attend.  So instead of this grandchild being at a sitter who is unrelated, I will bring the baby so he can be with cousins, Aunts, Uncles, Grandparents and etc.  It is to the point where my other children think it's the parents are being neglectful. The wife is not domestically inclined.  She does not keep him clean, do his laundry, or keep the house clean,  even on her days off.  My little grandson is very small for his age, almost malnourished.

How do I approach both parents and tell them they are neglecting thier child both physically and emotionally without causing a rift in the family and having them prevent me from seeing my grandson?

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