altre, altrio, altra, altri ?????
Ho un appartamento con tre .altre >>>>> Why not altri or is altre for women and altri for men ?
A brother and a sister, or a husband and a wife, are a "mixed gender" group.
Eighteen men and one woman is a mixed gender group.
In all cases there, you would use i loro to refer to "them".
You would only use le loro to refer to an all female group, as "them".
Same thing goes for Altri or Altre. All men, or a mixed gender group, uses Altri.