Tattoo "Forever my sister/brother

[Alex1992]

Dear reader,

I want to get a matching tattoo with my sister, and I hoped someone could help me out with this sentence:
"Forever my sister/brother"

I'm open to similar suggestions that might sound better in latin.

Thank you for your time in advance.

ps. I read in the guidelines that I should post a single post per sentence so if I violated any rules please let me know!

With kind regards,

Alex

 

[Matthaeus]

one possibility
FRATER MEVS IN PERPETVVM
SOROR MEA IN PERPETVVM

 

[Alex1992]

one possibility
FRATER MEVS IN PERPETVVM
SOROR MEA IN PERPETVVM

Thank you very much Matthaeus, you made my day!!