Yes, David Maddow is the elder brother of Rachel Maddow as per her Wikipedia details.

Rachel was born in Castro Valley, California and her family is that of 4 including her parents and her brother.

Her father, Robert B. Maddow, was a former US Air Force captain who resigned his commission the year before her birth. Similarly, her mother, Elaine, was a school program administrator.

Rachel was born as a second child to her parents and her partner is Susan Mikula.

Susan is an American artist and photographer who uses older technology to produce her photographs. 

The couple met in 1999 when Maddow was working on her doctoral dissertation. 

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