He's a fantastic husband to me but just seems completely indifferent to my children. They're 23 and 16 - the 23 year old doesn't live at home. Hardly communicates with the 16yo that lives with us. Never asks any questions or seems interested to discuss the 23yo. Is that normal for a step dad? He has a son who doesn't live with us and I'm always interested in what he's up to - school, hobbies, planning stuff for when he's with us. Should I expect more?