LORELAI: He calls like once a week and we see him at Christmas, sometimes Easter. It’s all very civil.
This is the point where we discover that Rory has had some contact with her father throughout her life, seeing him at least once a year and sometimes twice a year. The weekly phone call, like the one to Emily, seems something of a polite fiction – it seems greatly out of character for Christopher to phone so regularly. Most likely he phoned whenever he thought of it, which probably wasn’t that often.