I like how we all assume that if Jason and Roy were to get married, they wouldn't tell anyone... So, some thoughts on that:
They married as a cover for an undercover mission and before having a romantic relationship. They simply forgot (or chose not to) divorce for the tax benefits.
They would keep their surnames, although Jason might use the surname Harper for identification purposes so he could return to his studies.
Jason is listed as an emergency contact if Lian's school is unable to reach Roy.
If Roy gets pregnant or they decide to adopt children, they would have both surnames in alphabetical order (Harper-Todd).
Jason didn't tell anyone about the bats, but Roy did tell the arrows. They just assumed he was joking, and it became a running joke when Jason and Roy started dating.
Nobody knew they were married until one of them finished in the hospital and only the husband (and Lian) was given priority for visits.
They have wedding rings; Roy made Jason's and Jason made Roy's. They don't wear them on their hands; they have them on a chain and wear them as necklaces.
Although they may not seem like it, they get all sentimental on anniversaries.