How to Say "father-in-law" in Spanish
The Spanish word for “father-in-law” is “suegro” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi suegro es muy simpático y siempre cocina los domingos.
My father-in-law is very nice and always cooks on Sundays.
Tengo que comprar un regalo para el cumpleaños de mi suegro.
I have to buy a gift for my father-in-law's birthday.
Mi suegro trabajó como arquitecto durante treinta años.
My father-in-law worked as an architect for thirty years.
Male vs. Female family members
Spanish uses the ending '-o' for male family members and '-a' for female ones. While 'suegro' is the father-in-law, changing it to 'suegra' makes it mother-in-law.
Using 'the' vs 'my'
When talking directly to him, you just say 'Suegro'. When talking about him to others, you almost always use 'mi' (my) or 'el' (the) depending on the context.
Avoid literal translations
Mistake: “Mi padre en ley vive aquí.”
Correction: Mi suegro vive aquí. English uses 'in-law,' but Spanish has a single specific word for this relationship.
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