THERE IS A B() IN THIS FAMILY.补充完整

THERE IS A B() IN THIS FAMILY.补充完整
THERE IS A B() IN THIS FAMILY.补充完整

THERE IS A B() IN THIS FAMILY.补充完整
There is a baby in this family.这个家庭里有一个婴儿.
boy 不太像,这个家庭里有一个男孩儿,说得不通顺,说有一个儿子还可以.所以答案是：Baby.

“baby”婴儿的可能性比较大吧。

boy男孩