As many have said...it really is a individual type of decision.
You and your wife could do and and one, or both, or neither may find a problem getting back on track or a weight gain.

I personally have found that I can "cheat: on a special occasion and not have to deal with additional cravings or weight gain.

Others find the opposite to be true.

This could be a good test for both you and your wife what each of your bodies can handle.

It appears that the most successful and losing and maintaining weight loss are those the learn what their individual bodies need for nutrition.

Some people are 0 Carb, some are 20 or less, some are 40.

I say find what works for you and a experiment like this...could tell you both a lot.