Are Arenaria and Sciadopitys verticillata part of the same family? 
Arenaria (plant): Arenaria is a genus of flowering plants, within the family Caryophyllaceae. Sciadopitys:  It is the sole member of the family Sciadopityaceae and genus Sciadopitys, a living fossil with no close relatives, and known in the fossil record for about 230 million years.
no