yes. to have insurance on someone you have to have an insurable interest in them. basically you would have to be at a loss in some shape or fashion if they where to die. this is a very loose and subjective concept that companies very rarely challenge unless its a multi million dollar policy.
Your daughters husband is you son-in-law.
Uncle
Your grand daughter's husband is your grandson-in-law.
Mary Lee Cantwell's husband was literary agent Robert Lescher. They had two daughters - Katherine and Margaret.
The husbands own insurance would be primary, and his wife's would be secondary.
Son-in-law.
the daughter's cousin
London with her husband and twin daughters.
She had her husband, Kind Prasutagus, and two daughters.
He is your grandson by marriage or grandson in-law.
Yes only if you were previously insured with another company and lost your insurance or it is his companies renewal period , usually once a year.
Yes. If your husband's cousin is his first cousin, the cousin's daughters and your children are second cousins to each other. If your husband's cousin is his second cousin, the children are third cousins to each other.