Sadly, yours is an all too common situation. THere is no solution here, other than to cooperate fully with CPS and make sure that every effort is made by mom to ensure the safety of her children. CPS is indeed investigating your daughter and seems to be trying to find a reason to place the children in foster care. This is not something that they can just "do," however. A court case will need to be filed and your daughter will be able to obtain an attorney at county expense. For now, she shoulod do as she is told, she should be cooperative and deferential to CPS. These people can take her children away from her and your daughter needs to know that so she can do everything in her power to see that doesn;'t happen. Good luck.