you have lots of information and advice. You also need a living and upon death power of attorney as it will make things simpler if your father becomes really sick or becomes incoherent. Sorry ifI sound very bad and good luck
assessable income derived in you home country is taxable if you choose to be a tax resident of that country. Then there's DTA agreements also. Suggest you seek professional advice
it really depends on your circumstances said my Thai and Australian accountant. Are you an accountant and understand the tax rules in your home country and here?