In 1971, my parents Jerry and Anita Harris divorced.  Anita married Richard Hayden Carr on 30 Jul 1971, in Albuquerque, New Mexico.  Anita had three children, Teresa, Kurt & Wendy.  Rick had two, Kristi & Devon.
Hang on to your hats, it gets a little crazy keeping everyone straight. 
My father Jerry Harris married Sue Lannon Berry on 24 July 1972, in Albuquerque, New Mexico.  Together they had Lara, Tracy, & Krista.
Very recently I discovered my father's first wife.  Together they had a little girl who was born in California.
Keeping count?  I have two full siblings, two step siblings, and four half-siblings!