I don't know how your domestic partnership is arranged but part of the unspoken arrangement through which Steve keeps me in mascaras and standing mixers is that I am solely responsible for identifying, locating, acquiring, wrapping, and insuring that all presents for both sides of the family for every birthday Christmas promotion and Filipino-American Friendship Day arrive on time and in good taste.
Which means every few months I look at the calendar and exclaim "Damn it!" and then scurry into Steve's office bleating, "What do you want to get your (father/step-mother/sister/sister's husband) for (his/her/their) (birthday/anniversary/confirmation hearing)?" Steve will always respond with cold silence, which, to be fair, is exactly how I would react if he burst upon me resting in the bathtub one afternoon and shouted, "Quick! Earn something!" From each according to his abilities, to each according to his needs, and all that.
"I was thinking about getting your sister H. this beautiful camel-color English schoolgirl hat trimmed with brown velvet. It would look perfect with her coat." (NB I have, in fact, already bought the hat)
"I don't know...does H. have a head to put it on?"