Hi, Unfortunately at this time there is no way to add complex relationships like two brothers marrying two sisters online. The only option available is to add their information twice. We do hope to have this feature in the very near future. It is one of the thing being worked on as we speak! If you wanted to work in the free downloadable Family Tree Builder Software, I could let you know how to manage such a situation. Best Regards, Esther /MyHeritage Team
