Safe and shrewd to thaw frozen seafood, take out 1/3, refreeze remaining 2/3, take out second portion of 1/3, refreeze remaining 1/3?
My parents eat this lobster meat every week. Each plastic bag of frozen lobster, below, usually lasts 3 servings for them. But they're too lazy to put 1/3 of the frozen lobster meat into, then freezing, 3 separate bags. Here's their workaround.
Let's postulate that they freeze the new bag of frozen lobster meat right after purchase. When they want to eat the lobster meat, for their first serving, they'll thaw the plastic bag in the fridge. They'll take out 1/3 to eat, and put the plastic bag with 2/3's of lobster meat back in the freezer.
For serving #2, they repeat this process. They'll defrost the plastic bag, now with 2/3's of lobster meat, in the fridge. They'll take out 1/3 to eat, and put the plastic bag with 1/3 of lobster meat back in the freezer. Etc...
Is this repeated refreezing and thawing safe?
Even if this is safe, is this canny? Does the repeated refreezing and thawing affect its quality?