K.I.
You are perfectly within your rights to not want company.
If they want to come they can stay in a hotel. Be polite but firm and honest and own your feelings.
"I am aware you want to come and am grateful for the support however I am under a lot of stress and need to respectfully ask you to allow me my own space during this time. If you need help locating a good Hotel I can help you with that"
Best wishes and good positive thoughts to you and yours!
~Please don't take this as being snarky but the ALL CAPS thing is very distracting to read...for me anyway! :)