Brooklyn, NY - On 21 Kislev 1944, the Satmar Rebbe, Rabbi Yoel Teitelbaum zatzal, was rescued from the Bergen-Belson Nazi concentration camp along with 1368 other Jews. Since then, for the past 65 years, Satmar Hasidim have celebrated the day as a day of festivities which includes Divrei Torah, singing, and meals. The idea is based upon the notion of a personal Purim (See Chayei Odom Klal 41 for an elaboration).
(The above photo is Dec. 7, 1944 which was released by the United States Holocaust Memorial Museum shows the Satmar rebbe, third from left, with George Mantello, second from left, in white coat, arguing for the entry of the rebbe into Switzerland)
The event is usually topped off with grooms and brides that got married within the past week coming to the respective Rebbes at the end of the event and receiving all seven of the Sheva Brachos from the Rebbe. Both groups engaged in this custom as well, last night.
Here is Historical and Rare Footage from the The legendary Satmar Rebbe, The Baal Divrei Yoel, Reb Yoel Teitelbaum, (1887-1979) of Righteous Memory, at a Kuf Alef Kislev event in 1973 This event is held yearly as a Celebration of Thanksgiving In Honor of his rescue from the Nazis on 21 Kislev 1944.
Click on link for footage of the Seudah in 1976 (released last year).
Lakewoodsvoice goes for the heimeshe market.
Imagine someone has chas v'sholom a fire in his house and 9 kids die a horrible death and one child survives.While there is some nechoma in that, I would imagine there would be a very subdued celebration--even if that child became a godol hador and a tsaddik who had a tremendous influence on
Klal yisroel.
Chassidim see the Rebbe as a beloved father. In your analogy, perhaps descendants of the surviving child would mark that day as a day of thanks (of course with the regret for those that perished).