Hmm, so to surmise the changes we have so far:
Elizabeth of Clarence surviving, and succeeding her father as Queen, marrying her cousin, the 3rd Duke of Gloucester and Edinburgh and having issue. Her uncle Edward has twins, George and Victoria.
Ferdinand VII of Spain having three sons and a daughter, by two wives.
Pedro I of Brazil and IV of Portugal having two surviving sons and four surviving daughters, his eldest son inherits Portugal, second inherits Brazil.
Archduke Karl becomes Emperor after his brother Ferdinand's death in 1848, having married Maria Anna of Bavaria before then, their son Franz Josef becomes Emperor in 1861 after marrying Louise Elisabeth of France, daughter of Charles X of France.
Charles comte Artois dies in 1824, and his son Louis succeeds Louis XVIII as King Louis XIX of France, Charles Duke of Berry does not die in 1820, and instead survives and has more children, including the future Empress of Austria, he ascends the throne in 1844 after his brother's death, as King Charles X of France. He is succeeded by his son Henri V.
Denmark's succession is cleared by Prince Ferdinand of Denmark having sons with his wife and cousin, he inherits the throne in 1863 after the death of Frederick VIII, reigning for a year and a half before his son also named Ferdinand takes over.
Sweden: Carl XV's son survives and succeeds him.
Norway: Breaks away from Sweden in 1840, and becomes a independent Kingdom ruled by Georg, Duke of Mecklenburg Strelitz.
Greece is ruled by Leopold of Saxe Coburg Gotha, he marries Marie, daughter of Nicholas I, and their line rules Greece.
Belgium is fought over in the independence war, and then again following the failure for a definitive solution-possible implementation of Talleyrand plan after this second war.
Marriages:
Liz II to Henry, 3rd Duke of Gloucester and Edinburgh
Victoria to Albert of Saxe Coburg Gotha
George V of Hanover to a Russian Princess
Marie of Portugal to Ferdinand of Saxe Coburg Gotha
Leopold to Marie of Russia
Emperor Karl I to Maria Anna of Bavaria
Franz Josef to Louise Elisabeth of France
William V of Britain to Marie fo the Netherlands
Edward of Saxe Coburg Gotha to Elizabeth of Wied.
Adelaide to Frederick III of Germany
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If there's anyone else or anything else I've forgotten lpease feel free to add.