Probably easiest to merge the Julii, Brutii and Scipii into the SPQR faction and then make the SPQR faction appear as the Julii faction by changing data/text/expanded_bi.txt (I think - it might be different in original RTW). The entries in the curly brackets are the "real" faction names and the other entries are the "apparent" faction names. All references to SPQR in must change so they appear as Julii.
eg
Code:
{ROMANS_SENATE} S.P.Q.R.
woule become
Code:
{ROMANS_SENATE} THE HOUSE OF JULII
Every mention of SPQR must be changed. You could probably use the replace tool to change "S.P.Q.R." to "THE HOUSE OF JULII".
It could be a different file though
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