Yes, you can play on a LAN connection, offline assuming you both have your own PCs in the house. There is no split screen multilayer, yet. In fact, this is supposed to be the reason why only the PC version had it’s release date moved up. They didn’t see it as a requirement for the PC release and decided to work on the PS5 split screen issues, post PC release.

So PS5 will definitely have split screen functionality, and I suppose that might also go to PCs as well, but that’s just a guess on my side.