I don't know what my job title...pls help

I work part time for my parents small law firm. I basically swoop in whenever they need me and do a hodgepodge of roles. I want to put it on my resume but I really don't know how to label myself. I do reception work, a lot of IT, occasional payroll, and sort evidence and go over depositions (paralegal/legal secretary work). I don't know what to call this role but I fell like I'm missing an opportunity not including it in my resume.

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