just to be sure i understood 

--Biz temmuzda annemle .. We´ll arrive ( come ) to Mexico in july with mom 

   Meksikaya gelecegiz   

--kardesim evleniyor meksikli biriyle.. My brother gets married with someone mexican

--gelince seninle gorusmek istiyoruz..  When we come ..we want to see you

thank you very much

Your translation is correct.