Well, for the plane tickets, yes. But as for your share of the estate, no. He has to legally divide the estate and can be held personally liable if he is misusing estate assets or converting them for his own benefit.
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In order to know exactly what you are entitled to, you need to get a copy of the inventory. If he hasn't filed it within the mandatory timeline, you can file a "motion to compel inventory and accounting" and force him to come to court and appear before the probate judge and explain why he is violating the law and his duties as administrator of the estate. The judge can then order him to produce the inventory in XX days or face a contempt of court charge and be removed as administrator.
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I think you said you are in CA, so it may be cheaper to contact an attorney in MA to file the motion for you rather than having to fly back and forth for any hearings. It sounds like he is taking advantage of the fact that you are out of state.
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As for any bank accounts, as I said before, if you are the POD beneficiary or are listed as a joint owner with father, he can't touch it because it is not an asset of the estate. It would be your account upon father's death and only you could access it if it is POD or a joint account.
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Thanks.

Barrister

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