Genitive suffix

Genitive suffix: “-(n)In” (-nın, -nin, -nun, -nün, -ın, -in, -un, -ün)
>> suffix is “-In” in the words ending in consonants:
adam-ın (of the man)
>>suffix is “-nIn” in the words ending in vowels:
oda-nın (of the room)
Possessive suffix: “-(s)I” (-sı,-si, -su, -sü, -ı, -i, -u, -ü)
**Words ending in consonants => “-I”
Kalem-i (his/her pencil)
**Words ending in vowels => “-sI”
Kapı-sı (its door)
ó e.g oda-nın kapı-sı (the door of the room)
o-nun anne-si (his/her mother)
As you see, above examples are compounds.