Genderqueeries has a huge list of gender neutral titles for parents, relatives, spouses, everything. Here’s an excerpt:
Girlfriend/Boyfriend (non-serious relationship)
- Date; neutral, the person you are dating.
- Lover; neutral, implies sexual relationship.
- Boifriend; queer, boi is a particular gender identity.
- Girlboyfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Boygirlfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Paramour; neutral, someone you are having a sexual relationship with.
- Bothfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Genderfriend; queer, based on boyfriend and girlfriend.
- Sweetie; neutral, slightly cheesy.
- Sweetheart; neutral, cheesy or old-fashioned.
- [name]friend; queer, based on girlfriend and boyfriend.
- Cuddle Buddy; neutral, cheesy.
Girlfriend/Boyfriend (long-term/serious relationship)
- Partner; neutral.
- Significant Other; neutral, quite formal.
- S.O.; neutral, short for significant other, a tad formal.
- Other Half; neutral, informal.
- Boifriend; queer, boi is a particular gender identity.
- Girlboyfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Boygirlfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Paramour; neutral, someone you are having a sexual relationship with.
- Bothfriend; queer, for bigender or androgynous people, or perhaps binary trans people.
- Genderfriend; queer, based on boyfriend and girlfriend.
- Sweetie; neutral, slightly cheesy.
- Sweetheart; neutral, cheesy or old-fashioned.
- [name]friend; queer, based on girlfriend and boyfriend.
- Cuddle Buddy; neutral, cheesy.
- Steady; neutral, as in “going steady” or “steady girlfriend/boyfriend”.
- Soul Mate; neutral, slightly cheesy.