The most common and most likely answer to this crossword clue is the 7 letter word NEPHEWS
I've seen this crossword clue in The Guardian
N
E
P
H
E
W
S
More clues leading to the result NEPHEWS
- Writer’s back and she’s working to describe women family members
- Family boys with reports about Joseph? Not half!
- Relatives get a quarter — sighs of relief!
- Recent information across page on that man’s relatives
- Relatives born with expressions of relief
- Relatives getting directions — sighs of relief!
- Family members of Ephesians engaged in the latest
Buddy explains!

The straight part
We know that "family members" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case family members = nephews.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does NEPHEWS mean?
NEPHEWS noun- A son of one's sibling, brother-in-law, or sister-in-law; either a son of one's brother (fraternal nephew) or a son of one's sister (sororal nephew).
- A son of one's child.