possessive

[azz]

a. The cousin of John was at the party.
b. The cousin of Jane's husband was at the party.
​c. The first cousin of Jane's husband was at the party.

Are the above grammatically correct?

Many thanks

[Alan]

(A) no, (B) & (C) not really.

A. --> John's cousin
B. -->Jane's husband's cousin
C. ->Jane's husband's first cousin