What can I say to my father?

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Dear all, Can you give me some suggestion to persuade my father not to drink too much? I am so sad because my father often drink himself drunk.when he is drunk,he won't go to sleep,but have a lot of thing to say.what is worse,he will repeat his word for many times. I am very upset to this,he wdon't take my mother's advice.If he continue to drink in that way,I am worried about him,as it is not good to him. What can I do?I don't know what kinds of word can moved him.Is it useful to write the letter to him?Can you give me some advice? Kerry