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There needs to be an option other than spouse or partner such as joint heads of household or adults in household or something that will let you address the letters of the household to both of the adults when they are not married and we don't know if they are partners (such as mom/daughter, sisters, two roommates, etc.) It looks like right now the only way to get it to make a household with a salutation and addressee to both is to make the records inaccurate and call them spouses. It seems tacky to send a thank you for all they do or an invitation to a special event and only send it to the primary constituent.
Currently I make all of mine "spouses," ten on the next step I Have "Marital Status Actually Unknown. At least the second comment is accurate!