How to proceed with offer/financing?

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I am interested in househacking a duplex that is FSBO and not listed anywhere online. 3/1.5 & 2/1 that are outdated. Asking is 500k though I know there is plenty of wiggle room to come down.

The gentleman believes he has 5-10 years to live so isn’t in a huge rush. He is liquidating because his kids have no interest in owning rentals and would rather have the money. 

Since one big payout doesn’t seem to be the motivation here I’m wondering what financing angles you (Bigger Pockets Members) think I have/ should present? My wife and I are pre-approved but I’m wondering if we can get around needing to use financing with a good down and a payoff schedule that benefits both parties? I feel like this isn’t an everyday opportunity would love some ideas with taking the next step. Thanks in advance!