I'm a single mom who travels for work. My parents watch the boys when I'm out of town. This morning when I saw my kids for the first time they breezed through the house barely saying hello to me. I said how about a hug? They acted very annoyed and said hello briefly. Later my father said I sounded kinda weak and said when the boys don't say hello to him he just ignores them. I said I think they need to be taught manners and to say hello when an adult speaks to them. What do you think?