I'm not a parent, But speaking as someone who went to Canada for 10 months at the age of 19!
I grew up around the army, my dad was a serving soldier from before I was born up until I was 17, he was away alot which is to be expected, I had a good relationship with my dad, couldn't fault him, But for obvious reasons I was so much closer to my mum! The day I told my parents that I was going to canada (forever, at the time) my mum got really upset, and my dad was his usual self, didn't show emotion much!
Anyway the day I left, my mum and dad and 2 brothers took me to Heathrow, I was expecting the water works from my mum, But nope, when I walked towards the security cheeckpoint, I turned round and my dad was in absolute bits, I think it was the 2nd tome i had ever seen him cry!
I was just so shocked at my dad's reaction, I knew he would miss me but I was not expecting that! I skyped my parents atleast twice a week, my dad never missed the call!
Once I realised that Canada wasn't working out (gutted) I skyped my parents and told them I wanted to come back, as it was the hight of summer plane prices where very expensive and would take a few weeks to save the money up, there and then my dad booked my flight home!
Wasn't until I was back home that my mum had told me that dad his got very depressed that I left, was on tablets from the Gp!
To the this day and me and my missus have said we will love to Canada, But I have said I will not do it until my parents are no longer around