But if any widow have children or grandchildren, let them learn first to show piety towards their own family, and to requite their parents: for this is acceptable in the sight of God.
“Their own family” …
This is not to be restricted to parents only, or even to grandparents. Lenski’s comment on the Greek words so translated has the following,
“They are used with reference to dutifulness toward God, and toward one’s country, or one’s family, including parents, grandparents, and other relatives.”
For this is acceptable in the sight of God …
Despite the fact of this being stated positively, as an example of what pleases God, the negative is also true, namely, that failure to heed this injunction is not acceptable in the sight of God.
 R. C. H. Lenski, op. cit., p. 656.