I find the real elephant in the room is inheritance issues.
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Like others in this thread, I am a bit of a worrier. After yet another close call at my job (injured fairly badly), I am done with this career. Part of my worry is that I am only 41, very young to be thinking of quitting I realize. Yet, in the back of my mind I know that sometime in the hopefully distant future I will receive a financial windfall from my incredibly successful parents. I would guess 2M on the low end, 5M on the high end.... like I said, we are saving like maniacs and have already exceeded 1M in investable assets on our own. But it hard not to look at a future inheritance and realize that I am probably more than good to go to ER right bloody now. Forget that my wife still wants to work another 10 years in her 6 figure income job which she enjoys.... and that we live easily on 30k or less annually.
Despite all this, I still fret about leaving my current job...
I find there is not a lot of talk on this site about inheritances... is this because not many will receive any, or is it because its kind of creepy and grasping to talk about?
As others have said, unless there is a trust 'guaranteeing' a certain minimum level of assets, I would heavily discount it and use it more to the point of having an ability to turbocharge your bucket list if it materializes.
I'm in a somewhat similar boat - my parents have an estate that I really can't see them spending down to zero, given their net worth and their somewhat frugal habits. Also, there's a life insurance policy in a trust that is 'guaranteed' (as long as someone starts paying the premiums again at age 100 if either of them live that long).
I'll be able to retire comfortably without any inheritance, but it is somewhat of a challenge knowing that your NW could suddenly mushroom by 100%-200% overnight....yet, that may/may not happen until 20 years from now, at which point you would likely be retired already.
Suggest to your parents that you, the DW, and them do something together with a small part of the money so you all can be guaranteed to enjoy it now, so you don't have to go through the extended timeline to suddenly have more money than you know what to do with. Perhaps do a few trips, or buy a car that you could drive sometimes or perhaps an RV/camper, etc.
I don't know what your comfort level is with them on the topic of money, but if you shared your current financial status and goals, they might be more amenable to it and realize that you're not living day-to-day and only want to use their money for a good time because you have none of your own. If they have shared with you that you are an heir in their estate (and you aren't simply assuming that you are and will find out that instead they are leaving it all to some charities), stress to them that you thank them for their financial success, but you also want to see them enjoy some of the fruits of their labors, and think it would be more memorable for you to be able to enjoy just a small part of their stash with them now while they're still here, rather than have to spend/invest it all later on when they're gone and you can't make any more memories with them.