HOw do i deal with my drug addict father who is claiming he's dying of cancer?

find out if he is still smoking and drinking.if he is he hasn't got lung cancer .i have copd and i'm telling you now if he is smoking he is not sick . at any point i'd want proof before i exposed my children to him.you said he abused you what do you think he would do to your childred if he was left alone with them or to be honest would you really trust him around them.