die Schwiegermutter
mother-in-law
The mother of one's husband or wife.
Am Wochenende besuchen wir meine Schwiegermutter auf dem Land.
At the weekend, we're visiting my mother-in-law in the countryside.

mother-in-law
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mother-in-law
The mother of one's husband or wife.
Am Wochenende besuchen wir meine Schwiegermutter auf dem Land.
At the weekend, we're visiting my mother-in-law in the countryside.

The part 'Schwieger-' (in-law) refers to a family relationship created through marriage. You can also use this pattern for other family members: 'Schwiegervater' (father-in-law), 'Schwiegersohn' (son-in-law), 'Schwiegertochter' (daughter-in-law).
Mein Schwiegervater und meine Schwiegermutter kommen aus Italien.
My father-in-law and my mother-in-law are from Italy.
To make the relationship clear, the word is usually used with a possessive pronoun (meine, deine, seine ...) or with the genitive.
Meine Schwiegermutter kocht den besten Apfelkuchen.
My mother-in-law makes the best apple cake.
The figure of the mother-in-law is, in German-speaking countries as in other cultures, a common character in jokes and clichés. These jokes often deal with a difficult relationship between the mother-in-law and the son-in-law or daughter-in-law.
Er erzählte einen alten Witz über seine Schwiegermutter.
He told an old joke about his mother-in-law.
mother / nut
'die Mutter' and 'die Schwiegermutter' both belong to the family, but they refer to different people. 'die Mutter' is your own mother, that is, the mother of a child. 'die Schwiegermutter' is the mother of your husband or wife. The words can be confused because both contain 'Mutter'. The important thing is the relationship: your mother belongs directly to your family of origin. Your mother-in-law belongs to your family through your marriage or partnership.

Nele telefoniert am Montag mit ihrer Schwiegermutter wegen des Familienessens.
On Monday, Nele talks on the phone with her mother-in-law about the family dinner.
Nach der Arbeit besucht Tom seine Mutter und hilft ihr im Garten.
After work, Tom visits his mother and helps her in the garden.