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https://en.wikipedia.org/wiki/House_of_Braganza-Saxe-Coburg_and_Gotha sounds familiar line? 

https://en.wikipedia.org/wiki/House_of_Saxe-Coburg_and_Gotha-Koh%C3%A1ry

https://en.wikipedia.org/wiki/House_of_Saxe-Coburg_and_Gotha

So they married, in which families? 

Ferninand II
https://en.wikipedia.org/wiki/Ferdinand_II_of_Portugal
married https://en.wikipedia.org/wiki/Maria_II_of_Portugal they had many children, here's few we can discuss about: Luís I of Portugal, Maria Ana Princess George of Saxony, Antónia Princess of Hohenzolern...

https://en.wikipedia.org/wiki/Lu%C3%ADs_I_of_Portugal married
https://en.wikipedia.org/wiki/Maria_Pia_of_Savoy https://en.wikipedia.org/wiki/House_of_Savoy
had children
https://en.wikipedia.org/wiki/Leopold,_Prince_of_Hohenzollern
https://en.wikipedia.org/wiki/House_of_Hohenzollern
married
https://en.wikipedia.org/wiki/Infanta_Ant%C3%B3nia_of_Portugal
they had son https://en.wikipedia.org/wiki/William,_Prince_of_Hohenzollern who married
https://en.wikipedia.org/wiki/Princess_Maria_Teresa_of_Bourbon-Two_Sicilies_(1867%E2%80%931909)
https://en.wikipedia.org/wiki/House_of_Bourbon

who is THEIR son and was married to who and had children? 

https://en.wikipedia.org/wiki/Frederick,_Prince_of_Hohenzollern
married
https://en.wikipedia.org/wiki/Princess_Margarete_Karola_of_Saxony  
and she belongs to house... https://en.wikipedia.org/wiki/House_of_Wettin and the branches are.. 

Cadet branches:	
-Saxe-Weimar-Eisenach
-Saxe-Meiningen
-Saxe-Coburg and Gotha
-Windsor
-Saxe-Coburg-Gotha-Koháry Belgium
-Saxony

House of Wettin on the other hand: https://en.wikipedia.org/wiki/George,_King_of_Saxony married to https://en.wikipedia.org/wiki/Infanta_Maria_Anna_of_Portugal_(1843%E2%80%931884) who belonged to house of Braganza.. and where we go back to start but also continue..
https://en.wikipedia.org/wiki/House_of_Braganza 
they then had daughter https://en.wikipedia.org/wiki/Princess_Maria_Josepha_of_Saxony_(1867%E2%80%931944) who married https://en.wikipedia.org/wiki/Archduke_Otto_of_Austria_(1865%E2%80%931906) they belong to 
https://en.wikipedia.org/wiki/House_of_Habsburg-Lorraine

Cadet branches:
Austria-Este
Hohenberg
Habsburg-Tuscany
Habsburg-Mexico

https://en.wikipedia.org/wiki/House_of_Lorraine
https://en.wikipedia.org/wiki/House_of_Habsburg

Otto and Maria had son https://en.wikipedia.org/wiki/Charles_I_of_Austria who married again in Bourbon line.. https://en.wikipedia.org/wiki/Zita_of_Bourbon-Parma
AND THEY HAD SON https://en.wikipedia.org/wiki/Otto_von_Habsburg AND WHO IS OTTO HABSBURG? or should I ask where he was influential! "Member of the European Parliament for Germany" "Otto von Habsburg played a notable role in the revolutions of 1989, as a co-initiator of the Pan-European Picnic. Later he was a strong supporter of the EU membership of central and eastern European countries. A noted intellectual, he published several books on historical and political affairs. Otto has been described as one of the "architects of the European idea and of European integration" together with Robert Schuman, Konrad Adenauer, and Alcide De Gasperi."

and house on Braganza is coming other way too..
earlier mentioned Ferninand II had two sons with Maria Pia of Savoy, one of them https://en.wikipedia.org/wiki/Lu%C3%ADs_I_of_Portugal
who then had son..
https://en.wikipedia.org/wiki/Carlos_I_of_Portugal married
https://en.wikipedia.org/wiki/Am%C3%A9lie_of_Orl%C3%A9ans and they had son who belonged to which order? 
https://en.wikipedia.org/wiki/Manuel_II_of_Portugal
https://en.wikipedia.org/wiki/Order_of_the_Garter
and his wife was again from which line? https://en.wikipedia.org/wiki/Augusta_Victoria_of_Hohenzollern  They were second cousins, both being great-grandchildren of Ferdinand II of Portugal...

back to House of Hohenzollern... 
Cadet branches:
Prussian branch
Swabian branch
Romanian branch
it's a small circle spinning round and round. These are just few familylines, there's so many lines going different directions: Divide et impera.

Also:
https://en.wikipedia.org/wiki/Franconia