I couldn't find Francois and Delphine in the 1850 census index.The enumerator had horrible handwriting, so they may have been indexed under a different last name, if someone couldn't read the writing.I did find Martin in both 1850 and 1860, and Francois in 1860.
1850 Avoyelles Parish, Page 149b.
Dwelling 713/FAmily 713.
Martin Lacombe, 36, farmer, b Louisiana, cannot read or write
Azelie, 19, b Louisiana
Martin, 4, b LA
Zenon, 2, b LA
1860 Avoyelles Parish, PAge 307 Dwelling 88/Family 88.
Martin Lacombe, 45, Farmer Laborer, $60 personal property, b LA, cannot read or write
Azelie, 29, b LA, cannot read or write
Homere, 13, b LA
Zenon, 10, b LA
Horace, 8, b LA
Oneal, 6, b LA
Ozit, 5 (female), b LA
Julie, 2, b LA
1860 Avoyelles Parish, Page 328, Dwelling 235/Family 235.
Francois Lacombe, 44, Farm Laborer, $150 personal property, b LA, cannot read or write
Adelphine, 34, b LA, cannot read or write
Pierre, 14, b LA
Francois, 9, b LA
Azema, 6, b LA
Martinus, 2, male, b LA