Is it true that, if Albert doesn't marry an aristocrat, his fortune gets split up upon his death? Whereas, if he marries and aristocratic woman (and has a son), that son will inherit the entire fortune?
You need to separate the private fortune from the House Laws. Private fortune follow general German inheritance rules and being aristocrat or not has no any relevance for law. When the fortune is set in a family foundation, this can be conditioned, for an example that the properties of the foundation are given at the disposal of the Chef of the House. When a reference is made to the House Laws, then indeed it can be of influence what these House Laws state. Usually these designate who is the Chef (the most senior male born from an union which meets the requirements).
According the expert Emil Abt, who wrote the book
Mißheiraten in den deutschen Fürstenhäusern, unter besonderer Berücksichtigung der standesherrlichen Familien. (Heidelberg, 1911: Carl Winter's Universitätsbuchhandlung) the requirements for the House of Thurn und Taxis were (are) vested in the Family Treaty of 1831 and gives the following:
- a bride from the inland must have 16 noble ancestors
- a foreign bride must have the comital rank for at least 4 generations
I assume that with "inland" is meant: Bavaria. Okay, let us take a look at Gloria. Her family Schönburg-Glauchau belongs to the nobility of Saxony, so I assume the "foreign" rule is applicable (four generations of comital rank). No problem: the Schönburg-Glauchaus are
gräflich since 1700. The other requirement: at least 16 noble ancestors was no problem too:
0 Gloria Gräfin von Schönburg-Glauchau (1960)
PARENTS
1 Joachim
Graf von Schönburg-Glauchau (1929-1998)
2 Beatrix Maria
Gräfin Széchényi de Sárvár-Felsövidék (1930)
GRANDPARENTS
1.1 Karl
Graf von Schönburg-Glauchau (1899–1945)
1.2 Maria Anna
Gräfin Baworowska (1902–1988)
2.1 Valentin
Graf Széchényi von Sárvár-Felsövidék (1893–1954)
2.2 Maria
Prinzessin Gallitzin (1895–1976)
GREAT-GRANDPARENTS
1.1.1 Joachim
Graf von Schönburg-Glauchau (1873–1943)
1.1.2 Oktavia
Gräfin Chotek von Chotkowa und Wognin (1873–1946)
1.2.1 Rudolf
Graf Baworow-Baworowski (1865–1931)
1.2.2 Fanny Anna
Gräfin Chorinsky,
Freiin von Ledske (1876–1963)
2.1.1 Edmund
Graf Széchényi von Sárvár-Felsövidék (1839–1922)
2.1.2 Eulalia Christopulos (1854–1918)
2.2.1 Paul
Prinz Gallitzin (1856–1916)
2.2.2 Alexandra Nikolajewna
Prinzessin Meshcherskaya (1864–1941)
GREAT-GREAT-GRANDPARENTS
1.1.1.1 Karl
Graf von Schönburg-Glauchau (1832–1898)
1.1.1.2 Adelheid
Gräfin van Rechteren-Limpurg (1845–1873)
1.1.1.3 Boguslaw
Graf Chotek von Chotkow und Wognin(1829–1896)
1.1.1.4 Wilhelmine
Gräfin Kinski von Wchinitz und Tettau (1838–1885)
1.2.1.1 Adam
Graf Baworów-Baworowski
1.2.1.2 Franziska
Gräfin von Hardegg auf Glatz und im Machlande
1.2.1.3 Victor Paul
Graf Chorinsky, Freiherr von Ledske (1838–1901)
1.2.1.4 Anna
Gräfin von Trautmansdorff-Weinsberg (1843–…?)
2.1.1.1 István
Graf Széchényi von Sárvár-Felsövidék (1791–1860)
2.1.1.2 Crescência
Gräfin von Seilern und Aspang (1799–1875)
2.1.1.3 Gregoriu Christopoulos
2.1.1.4 Eufrosyne Caravas
2.2.1.1 Pavel
Prinz Galitzine (1822–1871)
2.2.1.2 Ekaterina
Prinzessin Trubetskoy (1831–1918)
2.2.1.3 Nikolai Petrovich
Prinz Mestschersky
2.2.1.4 Maria Alexandrowna
Gräfin Panin