Served 3 Day Notice to Pay Rent or Quit in SOCAL

I was served a 3 day notice to pay rent or quit when I told the landlord I needed more time to pay rent. The notice was made by the landlords son(who is an attorney for Personal Injury, Employment & Labor, Civil Rights) but not for eviction or a field similar to that. The form has the son's law office suite information so Im guessing he works independently? There were 2 notices one on the front door of the house & the other on my bedroom door. I live in house with the landlord who also resides here as it's their personal home for decades. The landlord rents it out for extra income. What ate my next steps? I am researching on what to do next & it says to go down to the court to see if they filed an eviction against me. I also thought I had to receive a 30 days notice for Southern California, Los Angeles area. I also have to say this notice looks like it was made on Microsoft word. It doesnt look legitimized. Any help would be appreciated. Thank you!!