How to sweeten the deal?

[Casey Langley]

I am curious how an experienced investor would sweeten the offer on a 1958 SFH myself and family of four are attempting to buy. We are not investors but would like to avoid overpaying as well as get the best price possible. One family has owned home since it was built in 1958 and the son is 75 years old and 98 year old mother recently passed. Owner has a shop with apartment he will live in full time. Asking 147,500 for 1600 square feet that needs updating but do not plan to change the footprint. There is an extra lot beside home. He will sell house alone for 120,000 and lot+house for 140,000 (claims this is lowest he will go). Claims he does not need cash at this point. He will not owner finance. Suggestions for negotiating or sweetening the deal?