I'd like to know how (or if) I can include the following non-standard relationship:
Sam marries Maggie and they have two children. Carter (Sam's brother) marries Cassie (Maggie's sister) and they have two children. Sadly Maggie & Carter both die fairly young. Sam & Cassie get together to bring up the 4 children as one family. After a while they marry and have another child of their own.