Sister and family see huge UFO at marin county civic center

Previously I reported on a huge UFO at the Marin County civic center when I was driving into the College of Marin.  MY sister and her two kids years later also saw a huge UFO just above hwy 101 at the marin county civic center.   The year of the sighting is based on best guess on my part recalling what she said.  On a side road above the hwy my sister was driving along when she was amazed to see a huge UFO below her hovring just over the hwy with traffic passing under it and no one appearing to notice the craft.  
She atopped the car and got out to look at it and could have easily bounced a tennis ball off of it.  The craft was making faint humming noise but no one else appeared to notice it.  As she and her kids watched black helicopters came over the hill and they chased the UFO around in ghe air over head above San Rafael.  
Finally the UFO took off flying north with the helicopters after it.  No one else still seemed to see the UFO.  Looking down on the hwy! traffic my sister thought what terrible fools they all were Years later black helicopters were involved in an attack on my sister  
About the same time coming home late at night to my home in the deep woods I was surprized to hear deep heavy growls of a large animal in the dark.  I pulled my legally carried firearm and a dog whistle begain to blow recalling the animal.  The next night this same scenario was repeated with a dog whistle again calling off the large animal growling in the dark  Its a dangerous game to play
Witness elects to remain totally anonymous; provides no contact information.  PD