"I have no brothers."
Translation:No tengo hermanos.
It is an irregular verb. There are several of these confusingly conjugated verbs in Spanish, such as: ser (soy, eres, es, somos, son), estar (estoy, estás, está, estamos, están), ir (voy, vas, va, vamos, van), tener (tengo, tienes, tiene, tenemos, tienen), etc. According to this ( http://www.linguasorb.com/spanish/irregular-verbs/), "the 13 most common Spanish verbs are all irregular. " It's a little confusing at first, but then again, so is English. :)