Since the following article, a summary of her 1992 book, is from the Daily Fail I'll post it here:
How Nancy Reagan's daughter Patti Davis fell for Beach Boy Dennis Wilson but had a tubal ligation fearing she would end up like her mother who popped pills like candy and viciously slapped her face, head and ears. Patti Davis kept constant tabs on Nancy Reagan's pill habit that included Librium, Valium, Miltown and Quaaludes, she revealed in her memoir.
She was seven before she learned that she had two half-siblings. Nancy didn't consider Michael and Maureen part of 'the family' - Reagan's first wife actress Jane Wyman was never to be mentioned.
Nancy was so enraged when she caught Patti eyeing freshly-baked cookies while shopping she was stopped by a policeman for erratic driving. Later, Nancy grabbed Patti by the arm, 'Don't you ignore me, young lady' and then that 'open palm crashes into my cheek.
Nancy was a hoarder who kept clothing she hadn't worn in years, wrapping paper, ribbons, old baskets, cheap vases that once held sent flowers By CAROLINE HOWE FOR DAILYMAIL.COM (continued)