Fredrik Engelstad
He is the son of writer Carl Fredrik Engelstad and physician Vibeke Engelstad , and a nephew of archivist Sigurd Engelstad . 
<triplet> Carl Fredrik Engelstad <subj> Fredrik Engelstad <obj> child <triplet> Fredrik Engelstad <subj> Carl Fredrik Engelstad <obj> father <subj> Vibeke Engelstad <obj> mother <triplet> Vibeke Engelstad <subj> Fredrik Engelstad <obj> child