They might want to work on those ejection mechanisms.

As for Colossal, wikipedia says, in depressing detail that indicates someone cares:

Gim Allon was mutated by a radioactive meteorite, gainingthe superhuman ability to increase his size.

With his parents' blessing, he joined the Legion of Super-Heroes, becoming a member in good standing. He had an unreciprocated crush on fellow Legionnaire Shrinking Violet; this crush was only returned when Violet was replaced by a shapeshifting impostor, a Durlan named Yera. The two were married; when the deception was exposed, he discovered that he was still in love with Yera, and they remained married. For a time, Colossal Boy's mother Marte Allon was the President of Earth.

This must have happened later, because I don't think the target market for these books wanted to see anyone get married or other mushy stuff. Although that might change in the far future, say, eight or ten months.