Evicting tenant not on the lease.

[Jan H.]

CA story, here it goes:

I have a property with 2 houses on it. It was rented to 3 elderly persons (retired), a couple and the wife's sister, all 3 of them have been on the lease for the past 2 years. They were living in the 'main' house and the daughter of the wife's sister lived in the in-law unit. Please note that the daughter had legal rights to live there as my lease states that only immediate family members may occupy the property.

Sadly, the two elderly ladies passed away earlier this year. The daughter is still in the in-law unit and has not been contributing to the expenses the elderly gentleman has now. Besides, there is a pest problem in the unit that need to be taken car of and she's been smoking inside which is a clear violation of the lease that she's not even on.

I told her this past weekend that she needed to move because his uncle (elderly gentleman) needs the space. She has no job and money so I am afraid it will be a hassle to get her out. Question: Do I have to evict her? Can I do that without evicting the main tenant, the elderly gentleman?