The Arabic language uses suffixes to express possession, adding it at the end of the words. It happens also in some European dialects and languages. Every suffix changes with each person.
In Arabic language there is any possessive pronoun as “my”, “Mein” “mon” “mi” “mio”. They just add a suffix at the end of the object:
Kitāb (book) -> + ī kitābī = my book
Uhkt (sister) -> +kum ukhtukum = your(pl) sister
Qalam (pen) -> + nā qalamnā = our pen
Umm (mother) -> +ka ummuka =your mother
Bayt (home) -> + baytuhun = their (f.) home