score:5
Here is:
A plan of Harlech Castle, built by Edward I between 1283 and 1295;
A modern view from the SSW (left-upper-left in plan above); and
A close-up of the Guard House itself.
As you can plainly see, the Guard House is more spacious than the other four towers combined, all five being three stories tall as well. The back half living quarters of one floor of the Guard House would have had inside measurements of about 25' x 50', a spacious 750 sq. feet, more than enough for a family considering no kitchen, lavatory, or play area is necessary - those all being supplied.
Harlech was established with a garrison of 36 men: a constable, 30 men, including 10 crossbowmen, a chaplain, a smith, carpenter and stonemason ....
The families of those other than the Constable and, in this case, the King would likely have lived outside the castle except during a siege. The castle was designed as a place of business, not a home except in in extremis.
The first Constable of Harlech Castle was John de Bonvillars, who had previously overseen the construction of Conwy Castle, from 1285 until his death by drowning in 1287. His widow Agnes de Bevillard remained Constable until succeeded in 1290 by James of Saint George - clearly Agnes would not have been entitled, or capable, of fulfilling the role of Constable unless fully involved in running the castle with her husband.
James of Saint George, the second Constable of Harlech, was a master mason and architect from Savoy who had designed Edward I's seven North Wales castles, including Conwy, Harlech, and Caernarfon, as well as Beaumaris on Anglesey.
In the case of Conwy Castle, another of Edward's North Wales castles, aroyal charter of 1284 decreed that the Constable was to also be Mayor of the nearby (new) town of Conwy - a practice that continues to this day as an ex officio duty of the current Mayor.
That Conwy Castle regularly fell into neglect suggests that perhaps combining the duties of Constable and Mayor was a poor idea, with the Constable perhaps living less frequently in the Guard House and more frequently in more lavish accomodations in town