Vanessa Hua May 6, 2021Updated: May 6, 2021, 4:19 pm Sisters Laurina Marcic (right) and Stephanie Marcic stand by their front gate last month in San Francisco. Laurina is vaccinated, as are the adults she lives with, but she is still following safety precautions because she is worried about the family members she lives with, such as her nephew, who are too young to be vaccinated. Photo: Lea Suzuki / The Chronicle When my friend reached for a hug, I flinched. We were both newly and fully vaccinated and had spent a dreamy afternoon outside by her pool. Though our families hadn’t seen each other in more than a year, we slid easily back into our conversation, blessedly unmasked.