Great-great-great-grandchild's husband.
My great-great-great-grandson-in-law is a good person.
Step-great-grandchild's husband.
step-great-grandson-in-law.
The husband of one's great-great-granddaughter.
My great-great-grandson-in-law is a good person.
Great-great-granddaughter's husband.
My great-great-grandson-in-law is a good person.
Great-great-grandchild's husband.
My great-great-grandson-in-law is a good person.
Great-great-great-granddaughter's husband.
My great-great-great-grandson-in-law is a good person.
The husband of one's great-granddaughter.
My great-grandson-in-law is a good person.