Shabbos 23b: One who always has candles lit will be zocheh to have sons who become Torah scholars.
Orach Chaim 263:1 Rema: A woman who usually lights two candles and forgot to light one week, must light three candles for the rest of her life.
שבת כג ע”ב אמר רב הונא: הרגיל בנר ־ הויין ליה בנים תלמידי חכמים
או”ח סימן רס”ג ס”א ברמ”א: האשה ששכחה פעם אחת להדליק מדלקת כל ימיה ג׳ נרות (מהרי״ל)
Once a married couple was staying at the wife’s parents for Yom Tov, and the young woman forgot to light. Her husband went to ask Rabbi Eisenstein in Lakewood whether she now had to light an extra candle for the rest of her life. The rav responded with a story: someone asked R’ Moshe Feinstein if a mother and daughter in the same house should both light in the dining room or in two different parts of the house. Reb Moshe responded, “Before you ask me that, ask whether both of them should light at all. Maybe once there are candles lit in a house, there is no mitzvah to light more!” Rabbi Eisenstein concluded, “Since it’s not so obvious that your wife was required to light, now that she forgot, she is not subject to the punishment of adding a candle.”
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