SeptMorn
Although I don't have any answers to this, I do have strong feelings about the question.
I do believe that spirits can visit us... maybe. Specifically, I believe that we as humans can and often do experience the
feeling that someone has come to visit us and to comfort us. This might be something that our brains manifest, a way to comfort us (IOW a powerful instance of imagination) or it might be because spirits physically exist and are able to make "contact" in some way...
Or it might be something in between the two. That's where I personally believe the answer lies. Who is to say "what" a spirit is? Some form of energy left behind by the departed? If so we also have this "energy" while we are living, so who is to say we can't subconsciously project it to manifest a spirit? Maybe that "attracts" the spirit in question? Maybe we are pulling on the "imprint" that person left on us while they were still alive? That would certainly be akin to "keeping someone alive in our memory" in a more physical sense.
So there's a lot of metaphysical hoo-ha for you, but the bottom line is that this is a question that it may be impossible to ever answer, at least while we are alive. I believe the important thing is our
belief and accepting the comfort that such an experience may give us. It may only increase anxiety to question it. Questioning it brings science into the equation, whereas this is really a matter of faith. I am a "man of science" but I have faith as well, for many things that are outside the realm of science... and I believe trying to mix the two rarely brings about any positive results.
(Back to the hoo-ha

) if a "spirit" is something that we manifest, either through memory or energy, then that spirit can manifest in several locations simultaneously. OTOH if there are physical spirits, they may very well exist outside the world of space and time as we know it. For them "being in two places at once" may have little meaning for them, just as we can talk on the phone, chat on the internet, and have a local discussion all at the same time.
So if you find yourself needing some "explanation" just remember that almost anything is possible. Defer to the realm of faith and accept his visits for what they are
to you. And don't try to rationalize your memories of your MIL. I agree with you, give it time. Maybe they know, or maybe deep down inside you know, that for right now dealing with one at a time is the best thing for you to do.
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-- The world is what we make of it --
-- Dave
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