Douglas had married Elizabeth , daughter of Alexander Stewart , 4th High Steward of Scotland , by whom he had his eldest son James .
Head entity: james Q361611 23
Tail entity: alexander stewart, 4th high steward of scotland Q1100506 7 8 9 10 11 12 13 14
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40