母子的英文：
母子。

After the birth, mother and child are doing well/nicely.
生产后，母子平安。

There were significant similarities between mother and son.
母子之间有很多相像的地方。

So Aunt Xue and her children moved into Pear Fragrance Court.
从此后薛家母子就在梨香院住了.

She was more like a mother to him than an elder sister.
"其名分虽系姊弟,其情状有如母子."