I realize the post is old, but replying anyway in case you still don't have any info to go on.
Sylvestre Marron, the one b. 1827 d. 1906 was married to Leonora Osuna. Leonora Osuna b. 11 Mar 1831 d. 1868 at 37 yrs of age. She was the sister of Felipa Osuna ... both their parents were Juan Maria Osuna and Maria Juliana Josefa Lopez. He was the Alcalde of San Diego under Spaniard rule.
Maria Felipa de Jesus Catalina Osuna, her husband, Juan Maria Romouldo Marron was b. 8 Feb 1808/d. 19 Sep 1853 M. 12 Jan 1834 (or Romualdo) ALSO had a son named Sylvestre; likely named after his much younger brother (the Sylvestre first noted above). In other words. Juan Maria Romouldo and Sylvestre were brothers; 19 yrs apart in age.
Here's what I have on Altamirano:
Justo Roberto Altamirano b. abt 1745 at Aguaje, Sonora, Mexico Married (1) abt 1767, probably at Alamos, Sonora, Mexico to: Maria Loreto Delfini(a) b. abt 1748 at Alamos, Sonora, Mexico Buried 9 July 1788 at Mission Dolores. (Believed to be of Indian descent as often recorded with no surname; later known as Maria Loreto Delfin Alviso) Buried 20 Jul 1825 at Mission Santa Clara.
Children: 1. Jose Antonio Altamirano b. abt 1768 at Tubac Presidio, Sonora, Mexico. M. 30 Jul 1787 at Mission Santa Clara to Maria Gertrudis Ammesquita. Buried 13 Feb 1789 at Mission Dolores.
2. Joseph Matias Altamirano b. abt 1773 at Tubac Presidio, Sonora, Mexico. Buried 16 Oct 1783 at Mission Delores (10 yrs.)
3. Joseph Marcos Altamirano b. 25 Apr 1777, bapt'd 27 APr 1777 at Mission Dolores. M. 15 Nov 1803 at Mission Santa Clara to Maria Ignacia Villavicencio (13 yrs.)Buried 14 Mar 1834 at Mission Santa Clara
4. Lucas Domingo Altamirano b. 17 Oct 1778; bapt'd. 18 Oct 1778 at Mission Santa Clara. M. abt 1799 to Geronima Garcia. Died 20 Dec 1821; buried 21 Dec 1821 at Mission Santa Clara.
5. Juan Miguel de Capistrano Altamirano b. 21 Oct 1780; bapt'd. 22 Oct 1780 at Mission Santa Clara. M. 7 Nov 1803 at Mission Santa Clara to Agustina Amesquita (18 yrs.)Buried 24 Jul 1811 at Mission Santa Dolores.
6. Joseph Ramon Altamirano b. 28 Aug 1782; bapt'd. 7 Sep 1782 at Mission Santa Clara. Buried 15 Jul 1807 at Mission Santa Dolores (Una caida de un caballo - fall from a horse.)
7. Joseph Romualdo Altamirano b. 10 Feb 1785; bapt'd 13 Feb 1785 at Mission Santa Clara. Died1 Oct 1792; buried 2 Oct 1792 at Mission Santa Clara (7 yrs. old)
Justo, their father married 2nd: 17 Dec 1792 at Mission Santa Clara to: Juana Gertrudis Coronado, unknown when born and she was also married first to Manuel Antuna. She was buried 24 Sept 1816 at Mission Santa Clara.
Justo Roberto Altamirano: Veteran from the Presidio at Tubac, Sonora, Mexico, an Anza 1776 family; on the escolta at Mission Santa Clara from its founding on 12 an 1777; settled at San Francisco 1791-1800; invalido in 1819-23; Eldridge says the family name died out in California.
Also note: Tubac Presidio THEN was considered Sonora, Mexico, but NOW, it's considered stateside as it's Tubac, Arizona. Lot's of history there.
That's all I have on Altamirano's ... from Marie Northrop's Spanish~Mexican families Vol #1 ... doesn't mean there isn't more, I simply don't know any further, but seems to be where it starts. You'll have to further dig to see if, or how, you tie into the Osuna/Marron families bc I don't see that noted here. Good luck in your hunt. Hope this helps you somewhat.