In olden times, as part of the Navajo wedding ceremony, a bride and groom would eat out of the same basket.
While they were eating, all their relatives would get a chance to lecture them about anything at all.
A Blessingway was performed to bless the new marriage.
After the ceremony, the groom became a member of his wife's family. When he traveled, he looked for members of his wife's family with whom to stay, not his own family.
The expression, "You're not losing a daughter, you're gaining a son," was not a Navajo expression, but it was the Navajo way.