I was talking about two different things. Not Remus and Tonks as family members.

Tonks and Sirius were cousin. And in the book Harry thought she had fallen in love with Sirius.
Thats just gross.

Tonks and Remus make a good couple. Until you get to the fact that they are thirteen years apart.
But I think her personality makes Remus happy.
I think that they were the perfect counter balance towards each other.