You let them in your home and speak to them which is beyond gracious then they go on complaining about your poor exMIL if they were without , they would be homeless. You stood up for your ex MIL and you shot some truth darts. Nothing wrong with that at all.
Let them eat their fermented oatmeal and apply for a mortgage without an income. Let reality bit them in the arse.
You are one classy lady. Smart and educated.
For the sake of you and JOB lets home they just go back to Siberia