kuzucumla köydeyiz

My guess as a learner:

We are in the country with my little lamb

kuzu = lamb

kuzucum = my little lamb (possibly a term of endearment like ´my cute friend´

kuzucumla = with my little lamb

köy = village

köyde = in the village, or in the country/rural area

+ iz suffix for we

Several of my young friends in Turkey use "köy" to refer to their ´home village" I guess because it is shorter than saying e.g.   "Kütahye" or "Gazintepe".

can you call a brother or a sister this way??

 we are in the village with my dear fellow

 you can call a brother, a sister, a son, a daughter, or a friend