Really difficult to pin it on the sushi unless you've had someone identify the strain of bacteria that caused the illness.
Seems like ti could have been anything your wife and daughter both ate throughout the week.
Here is a bit of info from Mayoclinic...
Contaminant Onset of symptoms Foods affected and means of transmission
Campylobacter 2 to 5 days Meat and poultry. Contamination occurs during processing if animal feces contact meat surfaces. Other sources include unpasteurized milk and contaminated water.
Clostridium botulinum 12 to 72 hours Home-canned foods with low acidity, improperly canned commercial foods, smoked or salted fish, potatoes baked in aluminum foil, and other foods kept at warm temperatures for too long.
Clostridium perfringens 8 to 16 hours Meats, stews and gravies. Commonly spread when serving dishes don't keep food hot enough or food is chilled too slowly.
Escherichia coli (E. coli) O157:H7 1 to 8 days Beef contaminated with feces during slaughter. Spread mainly by undercooked ground beef. Other sources include unpasteurized milk and apple cider, alfalfa sprouts, and contaminated water.
Giardia lamblia 1 to 2 weeks Raw, ready-to-eat produce and contaminated water. Can be spread by an infected food handler.
Hepatitis A 28 days Raw, ready-to-eat produce and shellfish from contaminated water. Can be spread by an infected food handler.
Listeria 9 to 48 hours Hot dogs, luncheon meats, unpasteurized milk and cheeses, and unwashed raw produce. Can be spread through contaminated soil and water.
Noroviruses (Norwalk-like viruses) 12 to 48 hours Raw, ready-to-eat produce and shellfish from contaminated water. Can be spread by an infected food handler.
Rotavirus 1 to 3 days Raw, ready-to-eat produce. Can be spread by an infected food handler.
Salmonella 1 to 3 days Raw or contaminated meat, poultry, milk or egg yolks. Survives inadequate cooking. Can be spread by knives, cutting surfaces or an infected food handler.
Shigella 24 to 48 hours Seafood and raw, ready-to-eat produce. Can be spread by an infected food handler.
Staphylococcus aureus 1 to 6 hours Meats and prepared salads, cream sauces, and cream-filled pastries. Can be spread by hand contact, coughing and sneezing.
Vibrio vulnificus 1 to 7 days Raw oysters and raw or undercooked mussels, clams, and whole scallops. Can be spread through contaminated seawater.
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