Boerky
I mean I suppose he has been a bit oblivious with changes, though he only changed appearance a couple of months ago. The telling about reincarnation would probably kill his mother considering he's pretty all she has, plus he himself doesn't really know how he died. I wouldn't dwell on that too much or you'll be spending a ton of time with unnecessary drama. Plus from what I see he's more of a actions rather than word person. If you want to mention his other life simply mention you remember another life like in Don's Skyrim, replacing or the other soul still existing can be quite awkward for some readers.