This is a large responsibility and I would think hard about how responsible you want to be for your father's finances as he ages.
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A few things to consider.
If inheritance is important to him, would it be worth gifting some amount to his heirs during his lifetime? Many on the boglehead forums prefer that to just leaving a huge lump sum when they pass. It allows the giver to see their families enjoy the money while they are still alive.
Are all of his other financial and health matters in order? Power of attorney? Wills? Estate planning?
If you are managing your father's finances, what level of involvement do you wish to have as your father needs increasingly difficult decisions made for him?
There are many things I would look at and consider in this situation, it goes far beyond drawing down his portfolio.
I'm sure many more experienced forum members will chime in.
All good things to think about!
He has an appt with his lawyer in March to re-do all his documents. POA, Will, Living will, ect. He and I have discussed this and we know who in the family will be POA and executer of his will. My siblings are all also aware. I've made my opinions on some of the matters (property held 50/50 with other individuals etc. clear- but all those choices are ultimately his).
I and one of my siblings in particular will be intimately involved in decisions going forward- everyone knows this plan.
He has given and plans to continue to give pre-inheritances to individuals. He has determined that amount, I feel that he isn't maximising the tax efficiency of it but he is giving at levels he is comfortable with- which is what I think is appropriate in any case since its HIS money- not mine.
It is a LOT of money- and he and I had a very frank decision last year before I gave him any input about the ramifications and that I cannot be held responsible if there is a market crash etc. This is just my advice, and I am NOT a professional. We spoke at length about his risk tolerance, desires for income, and wish to leave an inheritance.