How are Nadia and Noah related in View From Saturday?

Nadia
Diamondstein and Noah Gershom are not related, although their lives are connected in a couple of
interesting ways.  Nadia's paternal grandfather, Izzy Diamondstein, chose to marry Margaret
Draper late in life at the senior community of Century Village.  Nadia's father, Allen
Diamondstein, was supposed to be the best man for his father...