[5] His first wife was Alice of Norfolk, daughter of Thomas of Brotherton, and granddaughter of Edward I.
In March 1339 the King ordered William Trussell, escheator, to deliver to Montagu and his wife Alice her share of her father's lands.
[6][5] Montagu and his retainers assaulted Alice,[clarification needed] causing her death on 30 January 1352.
His heir was his seven-week-old son by his second marriage, Edward Montagu, who survived him by only three months.
At his death on 4 October 1361, any barony created by writ fell into abeyance, according to modern doctrine, among the surviving daughters of his father.