How can I convince my son to give me grandchildren?

I am sorry but you can not change his mind on the subject. He has made his choice and you have to at least show respect for that choice. A lot of people want grandkids but they don't get them. Be happy you already have grandkids from your girls. Outside of the family name ping on, are you saying you'd love that baby more so...you know he could have a girl and the family name would still end with him.