The following three forms of possessive pronoun "your" are used in Hindi. Your = Aapkaa, Aapki, Aapke = used with elders or formal acquaintances.(Respectful/formal) Your = Tumharaa, Tumhari, Tumhare = Used with equals .(Informal) Your = Teraa, Teri, Tere = used with children, near and dear ones. (intimate) I believe, you should use "Aapkaa/i/e with elders and Tumharaa/i/e with friends and other peoples.

teri/a/e is more informal than tumhari/a/e. Aapki/a/e is formal.

Tumhari and tumhara represents gender of object you talking about,,,, same way for close friends Teri and tera are used,,,,