Children call thier parents mom and dad, because human society is built around a social hierarchy. Your movement throught the system is associated with the adoption of titles so that even strangers can be informed of your social position and the role you play.
Educational entitlement allows one to achive status with names such as Proffessor or Doctor..etc....
Service ranks are such as Judge,Captain,Private,Officer
Social ranks are such as Sir,Mamm,Miss & Mother & Father,Chief, Priest(Father John)
The most important foundation a child learns is their role in society. As children get older and become more self aware of their impact and individualisms, they often might refer to their parents on a first name basis...but usually only at adulthood..and usually in a manner that depicts that they have realized that they are their parents equals...and might want to learn to know who their parents are as individual persons outside thier family role.
Children call you mother and father because you provide a service to them. You perform a role outside of your individual being. You can not be a father or mother without having children. Infact you will find most children who come from bad families, or whose father is never around much...will refer to that parent by first name basis....because he has not provided the service in which to be refered to in that manner.
At the begining its respect. At the end its respect. You carry it your whole way through life.
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