CraSH/imageSPACE / MEGA (left) American Foto Features / MEGA (right) Billie Lourd is sharing some details about how her children continue to keep in touch with their late grandmother, Carrie Fisher. Fisher passed away in 2016, and Lourd has since formed her own family with husband Austen Rydell. Over the years, Lourd has introduced her children to Fisher through her movies. Now, she is revealing another personal connection that allows them to f…