Lord Portarlington married the Honourable Harriett Lydia, daughter of Henry Montagu, 6th Baron Rokeby, in 1855.
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He was also the brother of Henry Montagu, later created Earl of Manchester, and of Sidney Montagu, ancestor of the Earls of Sandwich.
In 1642 he was presented by William Laud to the rectory of Allhallows, Bread Street; Laud made this presentation out of courtesy to Northumberland, and complained that, nonetheless, Henry Montagu, 1st Earl of Manchester, had written to pressure him, commanding him in the name of the House of Lords to give the benefice to Seaman.
In 1614 the College of Physicians appointed him to plead the immunity of the college from arms-bearing before the lord mayor, Sir Thomas Middleton, and the recorder, Sir Henry Montagu.