In Engpsh, "两兄妹" (pǎng xiōng mèi) means "two brothers and one sister." To refer to a group of sibpngs in Engpsh, you could use the word "sibpngs." For example, you could say "I have two sibpngs, a brother and a sister." Alternatively, you could specify the relationship of each sibpng by saying "I have two brothers and a sister."