Children:
- Justa Muguerza Oteiza
- Carlos Muguerza Oteiza was born on 05 Nov 1882 in Mutriku, Gipuzkoa.
- Jose Antonio Ceferino Muguerza Oteiza was born on 27 Aug 1884 in Mutriku, Gipuzkoa; died on 31 Aug 1964 in Ontario, Oregon; was buried in Sunset Cemetery, Ontario, Oregon.
- Jose Mariano Muguerza Oteiza was born on 22 Apr 1886 in Mutriku, Gipuzkoa.
- Luis Maria Muguerza Oteiza was born on 21 Jun 1887 in Mutriku, Gipuzkoa.
- Jose Francisco Muguerza Oteiza was born on 08 Oct 1889 in Mutriku, Gipuzkoa.
- Agapito Muguerza Oteiza was born on 16 Mar 1892 in Mutriku, Gipuzkoa.
- Maria Serafina Muguerza Oteiza was born on 30 Jul 1894 in Mutriku, Gipuzkoa.
- 1. Claudio Muguerza Oteiza was born on 17 Feb 1897 in Mutriku, Gipuzkoa; died on 07 Nov 1970 in Ontario, Oregon; was buried in Sunset Cemetery, Ontario, Oregon.
- Rosario Asuncion Muguerza Oteiza was born on 11 Oct 1899 in Mutriku, Gipuzkoa.
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