Can I customize my relationship with someone on Facebook?

[~purple~]

Instead of being "sisters" with someone, could I customize it? I want to make our relationship as being in an alliance. There's only a drop-down though, but I figured it would be funny if it could work.

[?]

no, unfortunately the only options are daughter, son, mother, father, brother, sister, aunt, uncle, niece, nephew, cousin (male), cousin (female), grandson, grandfather, grandmother, and granddaughter.