One of my sons has my last name. My LG has no objection but

I usually have to explain to Americans why the siblings have different last names. Otherwise, they thought my LG isn't his father or I'm divorced or something. But I have no regret. He's a good kid with all the good genes from my family. I tried to persuade my LG to let my bably get my last name too but he wouldn't. It's good but not convinient in America.