CA SFH PURCHASE - How should I designate Co- ownership on title

[Adam Olguin]

Scenario:

I am in the process of purchasing a high value single family home in California with my mother in law and my fiancé.

We plan to live in the home together as our primary residence for many years to come.

My mother in law is fronting the 20% down payment. My fiancé and I will be covering all closing costs and inspections costs. We ALL plan to split evenly the mortgage, upgrades, and maintenance of the home.

Ultimately my mother in law wants the hone to be owned by my fiancé and I (as a married couple) outright upon her passing.

Questions:

I am wondering how we should officially consider and designate “ownership” of the property and on the title report.

Should We consider it joint tenancy? Should we create a trust? Is this more of a tenancy in common situation? Perhaps community property with right of survivorship?

Any input and expertise is greatly appreciated, especially from any real estate attorneys out there!

Thanks!