KatyBaby1990 How did you lose the dad? Did he die as a played sim while you were playing the household? Did he die while you were not playing him? Do you have Life and Death? And are there any options on the urn/tombstones when you click on it?
The phone calls indicate he is still in your save atm but once a sim dies, the dead sim will be culled in in 90 in game days or so. When that happens, you need to be quick about moving the ghost into a household, so they won't get culled. You should be able to call him using a sim he was friends with. Look in the relationship panel for him and see what options are. Life and Death gave us the option to ask a ghost on a date so have the mom make the call. Once on the lot, he can be asked or invited to join the household. Once that is done, you can resurrect him if you want to. There should also be a summon option on the urn/tombstone that will call the ghost to the lot as well.
Hope this helps.