My dad wants to get divorced from my mom and I would not like that?

Hello, My dad has a history of making false accusations of infidelity towards my mom. They have been married for about 25 years and througout the last 17 years of marriage my dad has always had delusions that my mom has commited infidelity. Now my father wants to divorce my mom unless she accepts that she had an affair with a man who worked in our house before. Of course my mother will not admit to a false accusation. I am really sad as I would not like my family to separate from each other. I asked my dad what could save his marriage and he said that my mom would have to admit to infidelity. My mom doesn´t want to have to suffer anymore abuse, however she finds herself open to continue in the relationship if my father seeks help for his problem. I don´t know what to do? What can i do to help save my parents marriage? thanks einszweidrei

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