Four months after the " Titanic " sank , Madeleine Astor gave birth to his second son , John Jacob " Jakey " Astor VI .
Head entity: john jacob "jakey" astor vi Q3181819 18 19 20 21 22 23 24
Tail entity: madeleine astor Q271742 9 10
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P25