"They got married very young."
Translation:Brali se velmi mladí.
I need a refresher on the difference between "se" and "si" in this case. Do you use "se" when you marry each other and "si" when you marry an identified other person (Tom or Sofia)?
Brát se is used in the plural when you're speaking about people getting married to each other. You would use brát si when speaking about someone who is marrying someone else.