From the 1861 Census, it would appear that mother Margaret Morrison may have died and Hector father has remarried:
Cristy Cross, 40, wife, b. Gairloch, Ross-shire
Hester Cross, 51, Flesher, b. Contin, Ross-shire
Margrat Cross, 9, daughter, b. Knockbain
Mary Cross, 1, daughter, b. Knockbain
Address: Muchernick, Knockbain
Regards.
Monica