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May one steal the Afikoman on the night of the Seder?
Some communities are accustomed to have the children steal the Afikoman on the night of the Seder and hold it ransom until the father redeems it with a promissory gift of some kind. Other communities however specifically avoid doing so due to resemblance of the stealing prohibition, and so is the Chabad custom to avoid this Minhag.
 Many Ashkenazi communities
 Source: Chok Yaakov 472/2; Aruch Hashulchan 472/2; Mishneh Halachos 11/393; See Pesachim 109a “Chotfim Matzos Beleil Pesachim”, and as explained in Rambam Chameitz Umatzah 7/3, Sefer Hamichtam, Nimukei Yosef 109a it means “They grab/steal Matzos from each other”; Other Rishonim however explain this Gemara differently
The reason: This custom is followed as an incentive to keep the children awake. [Chok Yaakov ibid; Gemara ibid] There is no stealing prohibition involved being it us done as a holy custom, and is as if it is taken with consent of the father. [See Sukkah 45a regarding stealing Esrogim out of Simcha; Rama O.C. 695/2 regarding Purim; C.M. 378/9 regarding damages by Simchas Chasan Vekallah; Asei Leha Rav 6/35]
 Tzans; Beis Avi 3/26; Halichos Shlomo 9 footnote 210; Orchos Chaim Spinka 473/19; Most Sefardi communities don’t steal the Afikoman
 Hagada Shel Pesach of Rebbe “Afikoman”: “In the Rebbe’s home we are not accustomed to grab the Afikoman, and to mention the Mamar Chazal in Brachos 5b regarding tasting the taste of stealing”