echo 'digraph {

"Tsubame" -> "Yotaka" [taillabel = "Twin Brother of"]
"Tsubaki" -> "Yotaka" [taillabel = "younger brother of"]
"Yotaka" -> "Tsubaki" [taillabel = "Older sister of"]
"Tsubame" -> "Tsubaki" [taillabel = "Older sister of"]
"Yotaka" -> "Tsubame" [taillabel = "Twin Sister of"]
"Tsubaki" -> "Tsubame" [taillabel = "Younger Sister of"]
}' | dot -Tsvg > output.svg