Ihnatus
Since: Jun, 2015
Oct 31st 2015 at 2:56:43 PM
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It should be noticed that in some cultures such marriages are prohibited: since one pair is married, their siblings are considered now related and can't marry. Source for drama in many works in pre-revolution Russia (e.g. I can remember young characters of "War and Peace" discussing whose love should be sacrificed for another pair's happiness).
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Yensil
Since: Mar, 2018
Mar 23rd 2018 at 5:07:23 AM
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This type of drama also occurs when the spouse of a deceased person become involved. Perhaps this is a separate trope in need of it's own page, which this page could then link to?
What about situations where a parent is involved with someone and their child becomes involved with the partner's younger sibling?