Emmett and Bella have a very loving and passionate relationship, taking a lot of time and trust on both their parts to develop. Emmett is outgoing while Bella is the quieter type. They joke around with one another and play equal roles in their children's lives. They are a great team and love being parents more than anything else.
Jasper and Alice are described by Bella as being the most suited couple she knows, even though Alice is bubbly and energetic while Jasper is compassionate and sensible. They never fight and see eye to eye on everything.
Jacob and Renesmee as a couple don’t play a huge role in the stories. Jacob is mentioned more than Renesmee, but he’s often described as being completely taken by Renesmee.
Charlie and Renee are described as always acting like a teenaged couple. Bella takes after her father in the sense that he is the quieter one in the relationship and Renee is always full of life and youthful in spirit.
Carlisle and Esme are not seen in detail throughout the stories. But they both share strong work ethics and have been working together for most of their married life.
Mike and Jessica. Mentioned briefly in conversation. No detail.
Emmett and Renesmee briefly dated before meeting Bella and Jacob.
Emmett Sr. and Beth were briefly mentioned by Emmett in a few chapters. The two had a very private relationship, keeping it away from the media. During his funeral she breaks down and in that moment you see how deep their bond was.
Jacob and Angela where mentioned to have slept together in an early chapter of Just Like You. The relationship was purely physical and both did not continue it.
Emmett Jr. and Karen haven't been mentioned in great detail since Emmett was so young when they died. Emmett tells Bella he remembers his father looked at his mother the same way he did.
* More will be added as Unlike You develops.