Possible Clues:

• Accounts for all members of the family
• They're connected by blood or marriage
• The rest of the family is on alert, perhaps
• Telling contributions from family
• All in the family way? That'd be telling
• Joy wearing dress on a regular basis for family members
• Reports of intercourse
• 'Are they telling, perhaps? (9)'
• Telling, perhaps, that they're all in the family way
• Last bits of pie all put into portions for son and daughter perhaps