They are (only some of them, actually more):
Carl, Duke of Württemberg and his elder son
Max, Markgrave of Baden and his brother
Georg Friedrich, Prince of Prussia (many of Prussians now marry equally)
Anton-Gunter, Duke of Oldenburg and his son and brother
Prince Hans-Adam of Liechtenstein and his elder son Alois
Christoph, Duke of Schleswig-Holstein
Ernst August, Pr of Hannover
Archduke Georg of Austria, Otto's son (many of Habsburgs now marry equally)
Pr Ferdinand zur Lippe-Weißenfeld
Carl and his wife Princess Diana's (Orleans) children, of their 6 kids, four married titles. Their heir married a Princess of Wied, their two daughters married Counts, and their fourth son Philipp married Maria Carolina of Bavaria (the younger sister of Duchess Sophia, Hereditary Princess of Lichtenstein). Only two sons married commoners.
others:
Alexander, Prince of Schaumburg-Lippe- married a commoner secondly but his first wife and mother of his heir was Princess Marie Luise of Sayn-Wittgenstein-Berleburg
Stephan, Hereditary prince of Lippe- his wife is the daughter of Princess Madeleine of Sayn-Wittgenstein-Berleburg and is a Countess
Then there is Queen Marg's family. Benedicte's eldest daughter Alexandra is married to a count. Benedicte's sister in law Tatiana born a princess of Sayne-wittgenstein-berleburg was married to the Landgrave of Hesse. Her son is now Landgrave, and married to a countess.
If Gustav was to marry Carina, the heir would then be Bernhard Prince of Sayn-Wittgenstein-Hohenstein, and he is married to a Countess.
Ernst August's sister Princess Alexandra wed the 8th prince of Lenningen.
EA's brother Ludwig was married to a Countess. He committed suicide after finding her dead from a drug overdose. He asked EA to raise his 10 month old son, hours before he shot himself.
Alexandra's brother in law has been married three times. He gave up his place in succession to Alex's husband Andreas, when he married his second wife. His first wife was a princess, and his third was a countess.
Prince Manuel of Bavaria is married to Princess Anna of Sayn-Wittgenstein-Berleburg
Gui is married to Stef who is a Countess