No, and a grandparent certainly has an insurable interest in a grandchild's life. However, the insurer should notify the insured (or, if the insured is a minor, the insured's parents), which apparently has been done.
And there you go. No issue.
Are you saying that "adjusterjack's" speculation that these are whole life policies was correct?
It most certainly is not. Even if it were, by contacting the insurer and having the policy cancelled, you've done everything you can do. If the insurer believes that insurance fraud was committed, it can pursue the matter through the Department of Insurance.
What does and doesn't constitute an insurable interest is a matter of law. It's not something about which you can have an opinion. Are you aware of any Texas statute or case decision that says or held that, if a grandparent has no contact with a grandchild, he/she has no insurable interest in the child's life? I doubt any such statute or case exists, but I would certainly be interested to know if such a statute or case does exist.
That has nothing to do with anything.
No, and how do you know what his intent is?
Huh? Life insurance policies don't dictate what the beneficiary(ies) must do with the proceeds.