I know a LOT of adults who still call their maternal relative "Mummy". But the only people who still call their fathers "Daddy" are female. Mummy and Father sound about right.
Unless, as was common in my (middle class, privately educated) peer group, they play around with names. Ma and Pa (Mummy and Pa?), Pater and Mater, even Mama and Papa (in fun). I often call my father "Vati" which is German for Daddy and is pronounced "Farty".
All of which implies a remotely good familial relationship. Sherlock and Mycroft seem much more likely to use "Father" somehow...
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Unless, as was common in my (middle class, privately educated) peer group, they play around with names. Ma and Pa (Mummy and Pa?), Pater and Mater, even Mama and Papa (in fun). I often call my father "Vati" which is German for Daddy and is pronounced "Farty".
All of which implies a remotely good familial relationship. Sherlock and Mycroft seem much more likely to use "Father" somehow...