Sometimes people's problems are so trivial it is disgusting.

Wife wants husband to pay for costs of conception and he won't, obviously this guy is going to be miserly with any offspring and it sounds as if he doesn't want children or care that the wife does. Get a divorce and find a single father.

About the 18 year old grandchild who has never said thank you. Send the brat copies of other thank-you letters the rest of the brood have mailed along with a note. "We understand that you have never done this before but now that you are 18 people who do not love you as much as we do will probably be expecting thank you's for graduations, weddings, and even gifts which could be offered to you at work. We have a new policy which is to inform and educate our young adults thata thank you is expected, otherwise we don't know if the gift was received. So he is upset, so the parents are upset? Somewhere in one of the two generations grandparents missed the beat in etiquette. Expect courtesy, if you don't receive it, don't give any more gifts for a year. Try it.