Translation of "youngest child" into Japanese

When our youngest child was six years old and in the first grade at school, her teacher gave the children an in-class writing assignment.

我が家の末の娘が6歳で小学1年生だったとき,先生は授業で行う作文の課題を子供たちに与えました。

Parents may favor the youngest child in the family.

両親は、末っ子をえこひいきするかもしれない。

He was said to be Dosan SAITO 's youngest child .

斎藤 道三 の 末子 と い わ れ る 。