Three females, one a child, one young adult, and one middle-aged at delicatessen.
A grandmother, a mother and child are waiting in line at the deli.
There is no indication of the three females being related as a grandmother, a mother and child.
Being middle-aged doesn't make one a grandmother. A young adult need not be a mother. Three females can be at a delicatessen and yet not be waiting in line.
Three women of varying ages at a deli does not imply they are related, nor that they are waiting in line.