this is the scene in preview and following are renders I;ve gotten with decreasing settings: 

huh?

drawn

someone will say: show us your settings, and I need to know which settings

Please share your render settings first. I'm uncertain about the issue with your render. It's possible that your RAM is being overtaxed during the render, causing objects to go undetected. There might also be corruption in the scene file. What is the size of the final scene file? Have you altered any material shaders to assist with the rendering process?

By sharing your render settings he means, please click Render on your Menu on top of your Poser window, scroll down to Render Settings, then take a screenshot of what you use to render with, please.

For instance, these are mine for what I'm working on now. Just paste yours in. Once we got that, we can ask further questions, like: what are your computer's specs (memory, video card, etc.)

At first sight, it looks like you're having weird light settings, at least ones that are not giving any light at render time but only at preview time.

I've never seen something like this before. I think hborre's questions would be a good starting point. Once we see that, we might be able to come up with other ideas

render asttings:

final file size of render;

Okay. I want you to select Mother's House and its Body, just as you have on that render, then please find your parameter Dials window from your Poser Window menu if you don't already have open. In that window, click on the Properties tab, and show us what is checked and unchecked. I want to verify that entire house is not set as invisible first before we try to troubleshoot your lights.

ok for whatever reason, the parameters don't show even tho they did before

I did play some with lights...

I don't understand why that Mother's House does not have properties. That worries me. I can see you have its body selected. You may have to delete it and re-add it, after saving the scene with an alternate name in case it is corrupted.

The scene looks differently lighted than before, what did you do to the lights?

Suspicion of corruption lingers in the scene. The child has repositioned himself in his chair, now closer to the table. It might be wise to consider Rhia's suggestion and rebuild the scene using a new house prop.

I've seen this before: no apparent properties. Bug with the display, IMO. I'm thinking to this because the window has this visible (sorry I don't know the English word)

It shouldn't have any if it's empty, so that I think that the properties exist but remain hidden...

When the scroll bar is present and no Properties detail appears in the panel, it usually implies that the display has filled with empty space.  This scene needs to be reworked and props replaced.  There is a major corruption somewhere in the file.

As per info from Dr. Charles, this is a known glitch soon to be fixed. Closed poser then reopened and problem gone. Thank goodness 😅