Book: Children includes birth/death, how to include children's spouse names

[dm87]

The last generation included in my book lists only the names, birth and death dates and information of the children.

It is very important to one of my relatives, who lost her father as an infant, that her mother be named in the book, her mother is married to one of the children of the last generation covered in the book.

How can I include the spouse information of the children of the last generation in the book?

Thanks, Donna