Frederick I of Prussia relative Sophia of Hanover
first to Elizabeth Henrietta of Hesse-Kassel (1661-1683), with whom he had one child,
Louise Dorothea, born 1680, who died without issue at age 25.
then to Sophia Charlotte of Hanover (1668-1705), with whom he had
Frederick August (1685–1686)
Frederick William I, born in 1688, who succeeded him.
In 1708, he married Sophia Louise of Mecklenburg-Schwerin, who survived him but had no children by him.He also had an official mistress, Catharina von Wartenberg, between 1696 and 1711.  However, he was never known to make use of her services, being deeply in love with his second wife.
kin family member kinsman kinswoman relation by marriage