"We have two children, a boy and a girl."
Translation:Noi avem doi copii, un băiat și o fată.
You can go to System preferences > Keyboard > Input Sources > Add Romanian Keyboard. Duolingo also provides those special letters under the input box.
yes there is, set your phone's input language to romanian and hold the letter you want with an accent, for example 'a', and a menu will open to select either ă or â.