There still are many parts to this. You have a full year of coverage, but part of the year with the employer plan, and incorrectly covered CA overlap, but you didn't state if they got financial assistance to be repaid.

This:

https://proconnect.intuit.com/community/form-1095/help/how-to-enter-california-health-coverage-in-pr...

Has some guidance that should apply.

And this:

"I dont know what number to put in November and December for SLCSP, for only my parents as the number reported on 1095A is for my parents as well as myself"

Here: https://www.coveredca.com/learning-center/tax-forms-and-filing/form-ftb-3895/

Scroll down to the section for:

How do I find the second-lowest-cost Silver plan premium amount?