Agustin married Juliana Asteinza Erquiaga on 19 Aug 1828 in Lekeitio, Bizkaia. Juliana was born in Pedernales, Bizkaia. [Group Sheet] [Family Chart]

1. Manuela Maria Urquiaga Asteguinza was born on 30 Jun 1829 in Lekeitio, Bizkaia.
2. Maria Josefa Urquiaga Asteynsa was born on 27 Jun 1831 in Lekeitio, Bizkaia.
3. Magdalena Urquiaga Asteguinza was born on 14 Mar 1834 in Lekeitio, Bizkaia.
4. Maria Juana Urquiaga Astinza was born on 16 May 1836 in Lekeitio, Bizkaia.
5. Maria Clara Urquiaga Asteinza was born on 18 Jul 1838 in Lekeitio, Bizkaia.
6. Rita Urquiaga Asteinza was born on 19 Feb 1841 in Lekeitio, Bizkaia.
7. Josefa Ysidora Urquiaga Asteinza was born on 12 Apr 1843 in Lekeitio, Bizkaia.

Agustin married María Larrañaga Zabala on 3 Nov 1846 in Amoroto, Bizkaia. María was born in Xemein-Markina, Bizkaia. [Group Sheet] [Family Chart]

1. Jose Martin Urquiaga Larrinaga was born on 8 Nov 1847 in Lekeitio, Bizkaia.
2. Maria Francisca Urquiaga Larrañaga was born on 29 Oct 1849 in Lekeitio, Bizkaia.
3. Maria Antonia Urquiaga Larrañaga was born on 31 Jul 1853 in Lekeitio, Bizkaia.
4. Maria Jesus Urquiaga Larrañaga was born on 1 Jan 1856 in Lekeitio, Bizkaia.
5. José Maria Urquiaga Larrañaga was born on 24 Sep 1858 in Lekeitio, Bizkaia.
6. Maria Concepcion Urquiaga Larrinaga was born on 8 May 1862 in Lekeitio, Bizkaia.