Los Angeles: Actress Sandra Bullock and Bryan Randall's relationship seems to be more than a summer romance. A source has revealed that "things are very serious with them" and that the actress is open to the possibility of getting married again. "They are enjoying the last bit of the summer with the kids until school starts," a source shared with eonline.com. "They will be in Los Angeles more once the kids start going to school. Things are very serious with them," the source added. While they like to keep their relationship private and are rarely photographed together, fans learned that the couple went to Universal Studios Hollywood this summer for a family day. And when the actress, who was once married to TV personality Jesse James, and the photographer aren't working on passionate projects, they are "tied to the hip". "Sandra and Bryan are life partners. Their close friends have never seen Sandra this happy before," the source shared. "Sandra as of lately has been more open to the possibility of getting married again."