Mom’s home
All we can say is that we are just glad that this story did not end with the death of a parent, that would really put a dark spin on things. The only thing we can say that might make sense of all of this is that they just really missed their mom and were projecting.
What we mean by project, is that they were thinking so hard about their beloved mother, that she actually appeared, well at least in their minds. We hope that was the case, or there is someone pretending to be their mom running around inside their house. We like our version better than that.