But as far as Greek is concerned, relation translates to συγγένεια/σχέση. So, you'd either have to say
You and I have a relation- Εγώ κι εσύ έχουμε συγγένεια or
You and I are relatives/are related - Εγώ κι εσύ είμαστε συγγενείς,
in order for the sentence to make sense in Greek. ^.^
"relation" has several meanings -- it can refer to a family relationship, or to a person who is connected to you by a family relationship.
For example, in "Winnie the Pooh", Rabbit has a lot of "friends and relations" (i.e. relatives).
Compare e.g. definitions 4 and 5 at http://www.dictionary.com/browse/relation .
Is the γγ in this case pronounced as a g or ng? When I hover over it pronounces g while in the whole sentence it's ng. Are both accepted in normal speech?