Dictionaries don't have a word for the study of mothers, but mariology is the study of his mother
In the OT God's word was not only the medium of His communication with men;... [DOC] [TLE] Study | Define Study at Dictionary.com [PAR] Study definition, application of the mind to the acquisition of knowledge, as by 
reading, investigation, or reflection: ... See more synonyms on Thesaurus.com.