Just trying to unpack this a bit... There appears to be two things going on here.
1) The interim IVO you have been served with
2) Your brothers fraudulent behavior relating to impersonating your father (now deceased but then in hospital)
Regarding the IVO... Unjustified? Maybe... But a magistrate needs only to be satisfied that the applicant has some degree of fear to convert it to a final order.... Extremely low bar. He set you up for a breach? maybe... But guess what,.... you sitting down >>>>>
a protected person is not involved in the commission of an offence against this Act, and is not punishable as a principal offender, because the protected person encourages, permits or authorises conduct by the respondent that contravenes the family violence intervention order or family violence safety notice.
SOURCE >>> FAMILY VIOLENCE PROTECTION ACT 2008 - SECT 125 Protected person not guilty as abettor
At best, even proving that he intended to make you breach will have little to no affect on the outcome if the mag is satisfied that he has a degree of fear... The more emotional you are in defending yourself, the more the mag is likley to be satisfied that there is enough animosity involved to justify the order..... Even if most reasonable people agree that he deserves a smack in the mouth. It won't matter. This order is about protecting people... Even people who you & I may think don't need or deserve it .... So my advice is, try for an undertaking first, failing that, accept the thing without admissions.... What's it matter? not like you get along anyway.
Is there a will? ... who is named as executor?
Regarding the fraud .... has it been reported to police?