Cynurus
He was the son of Perseus and Andromeda and thus brother of Perses , Alcaeus , Sthenelus , Electryon , Mestor , Heleus , Gorgophone and Autochthe . 
<triplet> Perseus <subj> Andromeda <obj> spouse <subj> Perses <obj> child <subj> Heleus <obj> child <subj> Autochthe <obj> child <triplet> Andromeda <subj> Perseus <obj> spouse <subj> Perses <obj> child <subj> Electryon <obj> child <subj> Heleus <obj> child <triplet> Perses <subj> Perseus <obj> father <subj> Andromeda <obj> mother <subj> Sthenelus <obj> sibling <subj> Electryon <obj> sibling <subj> Gorgophone <obj> sibling <triplet> Sthenelus <subj> Perses <obj> sibling <subj> Electryon <obj> sibling <subj> Gorgophone <obj> sibling <triplet> Electryon <subj> Perses <obj> sibling <subj> Sthenelus <obj> sibling <subj> Gorgophone <obj> sibling <triplet> Heleus <subj> Andromeda <obj> mother <triplet> Gorgophone <subj> Perses <obj> sibling <subj> Sthenelus <obj> sibling <subj> Electryon <obj> sibling