Both are plural nominative. It's masculine vs feminine: fratres mei; sorores meae
Ok, pronunciation isnt the most important aspect of learning latim, but this content is un-learning us how to read latim.
There's no "rolled R" as English R sound, but only the H sound from English (same sound in Latim) and Spanish R/Russian R (done with vibrating tip tongue, which doesnt exist in English).
Also, the tonic syllable in never at the end (never French-like).
This problem only happens with this caster, all other have good pronunciation.