I went with Endar and Jono (and thus picked the 'Not listed' option) from the TNG episode "Suddenly human." I, for one, wouldn't want to live in Talarian society, and you can tell it is difficult for the crew to sympathize with anyone wanting to remain in Talarian society, there is a strong bond between Endar and his adopted human son.
I chose Worf and Alexander. Worf is such a complicated character on his own dealing with his Klingon heritage and Human upbringing. But then throw a kid into the mix and it adds so many layers of complexity to his situation. Alexander was at just the right age during TNG to be the most interesting in my opinion. Not a young infant or a whiny teenager (adult junior grade). It gave a perspective that had been missing up to that point in Star Trek - what is starship life like for a scared pre-teen who has experienced his own emotional ups and downs separate from the main cast?