If your father had a ‘workshop full of tools’, a lathe and a mill, then most likely there’s a lot that might be of fairly high value. And unless your already knowledgeable, it could be all too easy for someone to take advantage of that. In general, including most of the chucks, drill chucks, any fixed or traveling steadies will raise the lathe price by quite a bit, to even significantly more depending on what’s there. Additional tooling such as any cutting tools should not be included. Used cutting tools usually don’t fetch much, but again we don’t know how much and what you have.
A mill with a digital readout would increase the price, again it all depends if you have one and in some cases if it’s a known industrial model. Selling a mill with a single vise would be considered usual. But depending on all the accessory tooling you also might have, that could be worth a significant amount of money. Again, those and any cutting tools would all be additional to the mills price. I would be very careful and post pictures of all of what you have here before making any decisions about what to or not to include, and the asking price for what could be some expensive tooling and accessories.