Your primary residence is determined by where you live. You do not have a choice to claim that your residence is different from where you live. If you live in California and the home in Maryland is a second home, then you are a California resident.
Your driver's license and car registration do not determine your residence. When you move to California you will be required to get a California driver's license because you are a California resident. You cannot legally vote in Maryland if you live in California.
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