My friend has 2 dcs aged 7 and 9.
They are nice enough children in that they don't swear or hit (although they hit each other quite a lot!) but they don't seem to have a grasp of manners.
They rarely engage in conversation with adults but will interrupt conversations to get their mum's attention. They will either just stare at anyone who tries to engage with them or completely ignore.
Also they never say please or thank you. I bought them an ice cream this afternoon and they both just grabbed it from my hands.
Friend didn't say anything. Just smiled indulgently and praised them for being hungry and eating well 
AIBU to think that they are old enough to have some basic manners?