Questions & Answers about Завтра я хочу увидеться с твоей мамой.
Why use увидеться instead of just увидеть?
The regular verb увидеть just means "to see" (like spotting someone in a crowd). Adding the reflexive -ся ending makes it a reciprocal verb, meaning "to see each other" or "to meet up".
Why does the Russian sentence say "with your mother" (с твоей мамой) instead of just "your mother"?
Because увидеться is a reciprocal verb meaning "to see each other", Russian grammar treats the action as something two people do together. Therefore, you must use the preposition с (with) to link the verb to the person you are meeting.
How did твоя мама change into твоей мамой?
Because it follows the preposition с (with), it must be in the Instrumental case. For feminine nouns ending in -а, the ending changes to -ой, making мама become мамой. The word твоя changes to твоей so it matches the noun's case.
Why is увидеться in its infinitive (dictionary) form here?
It follows the conjugated verb хочу (I want). Just like in English ("I want to see"), when you have two verbs back-to-back, only the first one is conjugated to match the subject (я), and the second one stays in the infinitive.