With an existing order, you can file a Motion for Modification based on a material change in circumstance. Let the judge know that your ex's drinking has increased significantly since the order was entered, and explain how it's affecting the kids. Depending on how old the children are, they can testify that they'd prefer to be with you full time (anything over 6 is probably old enough).
You can also request that the mother be required to seek treatment for her drinking and that she only be permitted supervised visitation
until she can prove that she's well.
Kentucky doesn't post statewide modification forms on their website, but call the courthouse where the case was heard originally and ask if they have any. If not, you may be able to find what you need on www.uslegalforms.com or www.legalzoom.com.
If you don't want to go straight to court, you could try having a lawyer send a letter that you're going to seek full custody if she doesn't make efforts on her own to improve. Or you can send that letter yourself. But you'll need a court order to get the kids to stay with you all the time. if you believe the kids are in danger, talk to a local attorney about filing an Emergency Ex Parte Motion for Temporary Custody.
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