Here is the manumission document of Jean Baptiste Meuillon. It mentions no sister, just mother and son.

Document Date: 2/21/1777
Notary: Garic, vol. 8
Document Number: 67
Location: Orleans (including Chapitoulas).
Master: Luis Agustin of StCh Meullion
Master's Gender: 2
Name: Juan Bautista
Gender: male
Race: mulatto
Age: 12
Birthplace: Louisiana Creole
Freed: by living master
Relationship of freer to the freed: father
The manumission did not involve cash payment.
Slave was freed.
This slave's white father was certainly involved in the manumission process.
Reasons: for serving us with loyalty & love consistently...
no prices at all
Members of Group: N. mother and child
A condition was imposed on this manumission. 1 = yes.
Terms: serve until his death as befor
Family: Maria Juana-m,Jn Bta.-s
This slave's family relationships were indicated.
Comments: He inherited these slaves from his father Antonio Meullion, the slaves were not present at the emancipation, maybe they were in St. Charles Parish

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Document Date: 2/21/1777
Notary: Garic, vol. 8
Document Number: 67
Location: Orleans (including Chapitoulas).
Master: Luis Agustin of StCh Meullion
Master's Gender: 2
Name: Maria Juana
Gender: female
Race: black
Age: 40
Freed: by living master
The manumission did not involve cash payment.
Slave was freed.
Reasons: for serving us with loyalty & love consistently...
no prices at all
Members of Group: N. mother and child
A condition was imposed on this manumission. 1 = yes.
Terms: serve until his death as befor
Family: Maria Juana-m,Jn Bta.-s
This slave's family relationships were indicated.
Comments: He inherited these slaves from his father Antonio Meullion, the slaves were not present at the emancipation, maybe they were in St. Charles Parish