I've read that there is some debate as to who is the legal Carlist claimant, since the true male line died out in 1936. The main and more known branch is those descended from Roberto I of Parma, whose sister married Carlos, Duque de Madrid. However, another branch, the Habsburg-Lorraine (Tuscanny branch) are also claimants to the rights as legal Carlist claimants. The claim comes through the marriage of Carlos and Margherita's eldest daughter, who was the sister of Juan III. Juan died in 1931 and was single and evidently childless. He was "succeeded" by his ageing uncle, who died a few years later. Then the debate starts. The son of Margherita's brother's son, Francisco Javier (Javier I) or Carlos amd Marguerita's daughter's son Anton (his eldest brother married morganatically and then divorced). Can anyone say anythign about these pretenders, and moreover, their "queens"?
Carlos and Margarita's eldest daughter was Infanta Blanca (Blanche) 1868-1949.
She was the sister of Jaime (Jacques) I 1870-1931 (not of Juan III - 1822-87).
When Jaime I died unmarried and w/o children, the claim passed to his old (and childless) uncle Infante Alfonso-Carlos (1849-1936)
Blanca de Borbon had married Leopold Salvador of Habsburg-Tuscany.
They had a huge tribe:
1. Agnes-Maria-Theresia (1891-1945) (I am not sure about her. I've only seen her mentioned once)
2. Maria de los Dolores (1891- 1974)
3) Maria Immakulata (1892- 1971); m.Rome 14 Jul 1932 Nobile Inigo Neri Serneri (1891-1950)
4) Margarita Raineria (1894- 1986); m.Schloß Sonnberg 27 Nov 1937 Francesco Marchese Taliani di Marchio (1887- 1968)
5) Rainer (1895- 1930)
6) Leopold, naturalized in the USA as Leopold Lorraine 1953 (1897- 1958); m.1st (morganatically) Vienna 12 Apr 1919 (div 1931) Dagmar Bss Nicolics-Podrinska (1898- 1967); m.2d (morganatically) 1932 Alice Coburn (1894- 1960)
7) Maria Antonia (1899- 1977); m.1st Barcelona 16 Jul 1924 Ramon Orlandis y Villalonga (1896- 1936); m.2d Montevideo, Uruguay 1942 Don Luis Perez Sucre (1899- 1957)
Anton (1901- 1987); m.Sinaia 26 Jul 1931 (div 1954) Ileana Pss of Romania (1909- 1991)
9) Assunta (1902- 1993); m.Ouchy, nr Lausanne 17 Sep 1939 [16 Mar 1939?] (div 1950) Joseph Hopfinger (1905- 1992)
10) Franz Josef (1905- 1975); m.1st (morganatically) London 22 Jul 1937 (div) Maria Aloisa Baumer (1906- 1987); m.2d (morganatically) Zürich 21 Jan 1962 Maria Elena Seunig, Cdsa de Basus (1925- 1994)
11) Karl Pius (1909- 1953); m.(morganatically) Vienna 10 May 1938 (div 1950) Christa Satzger de Bálványos (1914- 2001) .
11a) Alejandra Blanca Gfn von Habsburg (1941); m.Barcelona Jose Riera y de Leyva (1934)
11aa) Alejandra Riera y de Habsburgo, b.Lima, Peru 1960; m.Barcelona 25 Sep 1987 Baldo Montaner Casanella (b. 1955)
11aaa) Mar Montaner Riera, b.Barcelona 1994
11aab) Violeta Montaner Riera
11ab) Carlos Pio Riera y de Habsburgo, b.Barcelona 1963; m.Mireia Mateu
11aba) Laura Riera Mateu
11abb) Blanca Riera Mateu
11abc) Pedro Riera y de Habsburgo, b.Barcelona 1965; m.Aliénor Benoist
11b) Maria Immaculada Pia Gfn von Habsburg (b.Barcelona 1945); m. 1969 John Howard Dobkin (b. 1942)