How does alcoholism in parents affect the DNA of children?

My dad was addicted to alcohol before we were born and I want to know how this affected me and my sister

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This a great question and there’s no straightforward answer. If the gene for alcoholism is in your family tree, there is a good chance (but not guaranteed) that this gene could be passed to your children. However, having this gene does not mean that your child will become an alcoholic.

I recommend reading more about the Foetal alcohol syndrome: