Hi, I have come across a few Ghostly problems that I feel fits this thread; maybe even as a partial solution (though I think the issue may actually be by design; if a fix were implemented it would make playing w/ ghosts much more fun/common.)
I came across the issue because I was getting tired of the hard-coded sim purge eliminating sims from my game. It’s particularly annoying in my legacy challenge as your current generation completely forgets about their parents and can start having romantic relations w/ their close cousins (even without any mods installed; they just forgot they were related so its fine for them to have a kid together.) Not being a fan of sim mods since they have messed up my computers in the past I tried to solve the issue by creating ghost families of my legacy ancestors (lets be honest; who really cares when the random townies get purged.)
Here is where the issue comes into play; Ghosts you invite to join your family get more interactions, which are fine, but I feel like they lack a few basics. I successfully moved my family ghosts back into my household and proceeded to move all the ghosts to a new lot to make room for expanding my legacy into the next generation. This works great for exempting them from being purged as they now live on a lot in the world and have survived 2 consecutive purges for me so far. However, it is impossible for them to be invited to visit via the phone despite them now being a playable sim in the world; it’s like they are still default ghosts in that respect. Perhaps this is an issue arising from the fact that I kept their gravestones on the lot where they died- the legacy family lot. Whether this is by design or not, it would be exceptional if playable ghosts received more interactions. Wouldn’t it be amazing if playable ghosts were able to answer their phones similar to townies, perhaps even if they could only be invited over at night, as they would give message saying “sorry I’m sleeping” during hours of 10am-7pm. Maybe I am getting ahead of myself with the get together expansion coming out soon…