'By marriage' indicates a person has become part of your family after marrying someone related to you.

Family Expansion

The phrase is descriptive and neutral, without any positive or negative connotations about the relationship.

Neutral Tone

'By marriage' signals a legal or formal expansion of family, not just a social or friendly relationship.

'By marriage' can imply a change in social, financial, or other status due to one's spouse's position.

Indicates that a status or title was not personally earned, but obtained through marrying someone.

Sometimes used to suggest that a person may not have certain qualities on their own, but only by relation to their spouse.