My brother is surveilling my father's phone. Do I need to be worried?
My (40sF) oldest brother (40sM) is one of the most intimidating men I know. He owns a company that contracts with the DOD and trains foreign militaries in weapons and war tech. He's also a multi millionaire. He's incredibly entitled and absolutely hates me and my sister. I haven't spoken to him directly in over 15 years.
What led to the discovery:
There is an ongoing probate issue between all 4 of the siblings atm, regarding our grandma's estate. It's nothing lavish, but is a decent amount of money. It's been contentious to say the least, but suddenly the siblings group emails became personal. My oldest brother accused me of "treating dad like trash" amongst about 15 other cheap shot insults.
I called my dad today to make sure to clear this up. My dad lives near my brother and they are close. I asked my dad if he felt like I treated him like trash, because I was genuinely curious. I explained that is was (oldest brother) who made the claim and **my dad says, "well sometimes I think (oldest brother) is able to read my text conversations, so he probably was referring to something you said there".** Context: my dad and I had a conflict about housing and I got upset, but nothing egregious was said.
What I need advice with:
My brother would 10000% be able to hack or install something in my dad's phone due to his line of work. My dad lives half way across America so the phone is our only connection. Is there anything I can do to ensure MY phone hasn't been similarly hacked? Or something I can do to block myself from his view? I'm not a tech person, so I don't know how alarming this is or not.