Wait...grandmother right?! Hmm.
While i'm not usually an advocate of this approach, might a good old fashioned guilt trip work?
"But GMIL, he owes me £xxx, that's £xxx i was going to spend on BabySuper/That's £xxx worth fo food he's taken out of BabySuper's mouth. I have to protect my family, if i'm making stuff for free i can't make stuff for money, and your great grandchild suffers because i'm not bringing in enough money."
Adjust as needed of course.
While i'm not usually an advocate of this approach, might a good old fashioned guilt trip work?
"But GMIL, he owes me £xxx, that's £xxx i was going to spend on BabySuper/That's £xxx worth fo food he's taken out of BabySuper's mouth. I have to protect my family, if i'm making stuff for free i can't make stuff for money, and your great grandchild suffers because i'm not bringing in enough money."
Adjust as needed of course.

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