Can my 64-year-old dad retire soon? $700k assets + Social Security

I'm trying to help my dad figure out when he can realistically retire and how to handle an upcoming inheritance. I've been crunching the numbers, but I'd like some outside opinions, especially regarding strategy about this inheritance. Current situation: Dad is 64 and makes about $180k/year About $300k in his 401(k), currently invested in SPY/S&P 500 adjacent fund Receiving approximately $400k inheritance Mom already receives $1,300/month Social Security Dad's Social Security estimates: No

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