What can I do if a relative keeps trying to euthanize me and my children?

I have this relative i call uncle, he’s like my brother by law

his girlfriend now wife kept putting me in the phyward and euthanized me several times. When I had brought children home that were suspected my mine he euthanized them he was pretending like he was the father and said he was just going to euthanize all my children

what do I do

I've made police reports about him before about him stealing my children and maybe about the euthanzation

his wife isn’t shit but a mental hospital nurse

What can I do if a relative keeps trying to euthanize me and my children?
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