"Aceștia sunt fiii mei."

Translation: These are my sons.

[gelfo]

fiii is only for males? It can't mean a mix of both males and females like with other Latin based languages? I guess we would use copii in that case..

[potestasity]

Yes, "fiii" is exclusively male. Use "copiii" for a mixed group.

[gelfo]

mersi tare mult pentru rasponsul ta

[IXL_hater]

It is "copii" not "copiii".