Frank J. Marshall's son Frank Rice Marshall (born 1905.12.28).

Frank and Carrie decided to travel to Ostende 1907 together with their son (page 16 of "My Fifty Years of Chess" by Frank J. Marshall (New York, 1942): <‘Carrie and I decided that we would go abroad together and take Frankie along, although he was only 16 months old.’>).

A bit more on Frank Rice Marshall:

Edward Winter: <Page 5 of the January-February 1945 American Chess Bulletin presented him in army uniform (and stated that he had served in France as a corporal in the Signal Corps and that ‘he weathered three of the major campaigns with Gen. Patton’s army’).>

Marshall i Sverige (in Swedish)

http://www.jora.info/essayer/marsha...

'When the Palestine team played the USA (in the 1935 Chess Olympiad) it was the late David Enoch 's turn to play Frank James Marshall . He played well and had a considerable advantage (two pawns) and was sure he would win easily. I remember that during the adjournment I warned Enoch to be careful, precisely because he has the advantage, for he is playing the <king of swindlers!>. And indeed, what I feared happened... one inaccurate move was enough for Frank James Marshall to pull out of his sleeve a counter-combination and draw the lost battle. You should have seen the old man's joy after saving the draw; it was as if he had won.'

(p.53, "History of Chess", 1963 by Moshe Czerniak)

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Addendum (tournament review):

The Hudson Theater, which had priced tickets up to $100 a seat, was rarely full during the month of the matches, but the Marshall Club was often packed. Upon arriving in New York, many astute chess fans from all over the country often visited the Marshall's ivy-covered town house, its green-trimmed bay windows overlooking the sidewalk of West 10th Street. The anxious aficionados entered through the stately front doors and made their way to the drawing room, where antique chess tables with intricate wood inlays had been pushed aside to make room for the crowd.

It was natural that chess fans should gather there when not at the theater, because to the cognoscenti, the Marshall is among the most hallowed of chess clubs. In the institution's 76-year history,< Kasparov and Karpov are the only world champions who haven't set foot in the Marshall.> "And that's only because this is the age of the chess entrepreneur," says the club's former vice-president and treasurer, Matthew Gross. <"Kasparov wants $8,000 to make an appearance>. We simply can't afford that."