Shabbat candle lighting when staying at parents' home

Answer

Shalom u-verachah,

The matter is explained in the Shulchan Aruch and the Rema (Orach Chaim siman 263, se'if 8), regarding several families that eat in one place: according to the Shulchan Aruch one must be careful concerning a doubtful brachah, and therefore there should be only one brachah, since there is already light in the place of lighting; while according to the Rema the custom is to recite a brachah over each lamp, since every addition of light brings shalom bayit and joy.

Therefore, for those who follow the Rema's opinion, there is a custom that the daughter-in-law also lights with a brachah near the place of eating (Shemirat Shabbat Ke-Hilchatah, chapter 45, se'if 8. However, it is preferable to light in the bedroom, but one must be careful regarding safety).

And for those who follow the Shulchan Aruch, only one brachah should be recited when lighting in the place of eating, and therefore the hostess recites the brachah and intends to fulfill the obligation on behalf of the entire family, and the daughter-in-law listens. However, when a special bedroom is designated for the son and daughter-in-law, the poskim wrote that they should light a candle with a brachah in the bedroom. I consulted a scholar, and he told me that since light generally enters the room, the custom is not to light a candle in the bedroom, and one fulfills the obligation through the mother-in-law's lighting in the place of eating. It should be added that safety must be maintained.