My question involves real estate located in the State of: California
This is in California.
There is a house property that a married couple gave to their 8 children when the married couple died. All 8 children now have their name on the deed of the property. All 8 of the children decided to give the house to one of the 8 children, Mike, so they all signed the papers that would give all the "ownership shares" to Mike that was going to own it, and who was now moved into it with his wife. The papers with all the signatures that would transfer the property to Mike was found to be invalid because his sister Bridget used a fake name (she was running from the authorities). When Mike tried to have the process redone, Bridget refused to sign the paper again to have it properly done, so it was never finished. But all the siblings were content to have Mike and his family live in the property anyways.
Now, a few years later Mike died of diabetic complications, but his wife and kids continued living in the house without any fuss from Mike's siblings. His wife, Samantha, paid all the property taxes, etc., all the taxes and legal stuff was completely taken care of by her.
Now, a few years later again, all the remaining 7 siblings secretly agreed together, and came to Samantha and said they are going to evict her and sell the house. Samantha doesn't want to leave.
What are her options? Since her husband Mike's name is still on the deed that currently carries the authority, did his share of the ownership go to her after he died?
Does the fact that she has been taking care of all the expenses and upkeep completely by herself carry any weight?
Do the 7 siblings have the authority to force her out of the house?
Does the invalid paper that shows they had all signed it over to her carry any weight as evidence if the situation went to court?
Does adverse possession exist as an option here?