i'm very sorry you lost your mom and your wife in such a short period of time.
i agree that it is difficult to find nonreligious grief information.
and for the record, i am not "religious" in the traditional sense.
i don't believe in god. i don't believe in heaven. i am not a participant of any organized religion and i certainly don't go to church.
i do, however, believe in an afterlife, and believe people can communicate with us (in various ways) after they die. i believe we see/reunite with those we love after we die. i guess i'm a "spiritualist" if i need to put a label on it. i saw my first and only ghost (a relative who appeared as she had when living, and talked to me just as she always had, although she'd been dead for about a year) when i was six years old. she scared the crap out of me.
and in spite of that rather traumatizing experience, for years as an adult i was far more comfortable with the concept of: "when you're dead, you're dead." it was logical, so rational, so plain and simple.
eventually i had to come to terms with the fact that it (the ghost thing) happened to me and that i saw it firsthand and couldn't excuse it or rationalize it away. (no, it didn't happen at night, no i wasn't dreaming, no i wasn't even close to or attached to this woman.) so between that (and other various "woo woo" things throughout the years) i had to tweek my belief system.
obviously we all have our own experiences--just thought i'd share a bit of mine with you.
i hope you're doing okay farmer-rick