Children:
- Juan Francisco Xavier Muguerza Alcain was born on 19 Oct 1841 in Mutriku, Gipuzkoa.
- Juan Antonio Muguerza Alcain was born on 6 May 1844 in Mutriku, Gipuzkoa.
- Maria Evarista Muguerza Alcain was born on 26 Oct 1846 in Mutriku, Gipuzkoa; died on 3 Mar 1854 in Mutriku, Gipuzkoa.
- Jose Maria Castor Muguerza Alcain was born on 28 Mar 1849 in Mutriku, Gipuzkoa; died on 29 Feb 1862 in Mutriku, Gipuzkoa.
- Juan Lorenzo Muguerza Alcain was born on 17 Jan 1852 in Mutriku, Gipuzkoa.
- 1. Cecilio Venancio Muguerza Alcain was born on 1 Feb 1855 in Mutriku, Gipuzkoa.
- Antonia Maria Benita Muguerza Alcain was born on 12 Jan 1858 in Mutriku, Gipuzkoa.
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