I have grandchildren and step-grandchildren and I would like to spend time with them.

我有孙子还有继孙，我很想多花点时间和他们在一起。

youdao

Lois Lockett, a widow, had two sons, four grandchildren, a step grandchild, two daughters-in-law and an ex-daughter-in-law.

FORBES: Family Limited Partnership Needs To Have Partners - Plural