TL;DR: They had a loving/stable household and family life. Rarely apart and deeply considerate and loving with one another. Scouted by a fashion intern just before their father gets killed on an expedition in a freak accident and their mother falls ill from the heartbreak. The twins take a break from their growing careers and nurse her as best they can while dealing with their own grief. When she recovers enough to help herself they go back to work and make a name for themselves.

Dragonkin mate for life and there’s no record or mouths that speak to the contrary. Once dragonkin has courted/been courted successfully the parties in the relationship are linked for the duration of their lifespan. While not the longest lived race, dragonkin are among the top three in longevity. The Asano flight - dragonkin with a long line of familial bonds - were regarded as non-traditionalists. A majority of the flight settled down after courtship which wasn’t a common occurrence among dragonkin as a whole.

Laika was one such dragonkin. She was still wandering when she met her bondmate. They saw each other occasionally and eventually a wave or nod of greeting became long talks about their different cultures and the ideals of said cultures. Hirato was a canine Beastkin that was regarded as a scholar. Over various meet-ups and an eventual courtship they got married. Hirato took his wife’s flight name and some time later Laika became pregnant.

As an elemental dragonkin with an earth domain she and Hirato were agreed on a standard hospital delivery. Unfortunately life doesn’t like sticking to a plan and while out on a beach trip Laika went into labor and gave birth to mirror twins. Dragon blood is extremely dominant thus both children were born dragonkin. Welcoming their newborn sons was a joyous event and the family was very much healthy and adoring.

The twins were born mere seconds apart and those seconds are largely disregarded due to them only being announced after the first twin exited to the womb gripping the second by the hand. Laika took the connection as a sign to keep them together for as long as they wanted.

Growing up, the twins were hardly apart for longer than five minutes or so at a time. Kurogiri - the elder twin - was the ‘leader’ of the duo and Kuroko acted as the ‘brain’. Though their parents worried initially it became clear that neither twin asserted himself over the other. They struck a deep seated balance that showed how much they valued one another.

Kuroko was born with a ‘weaker’ immune system. While he wasn’t frail or sickly any large shift that occurred suddenly could affect his health. Kurogiri had no such issue but minimized the ill-effects efficiently and effectively. As ‘true’ mirrors, both twins were indistinguishable from the other. They favored their mother for her ability to tell them apart even when they attempted to prank her. Their father always fell into the trap and ended up paying for treats to pacify the twins' disappointment in his perception.

Hirato left for an expedition he was invited to sometime after the twins' fourteenth birthday. He gifted them each pendants - a moon for Kurogiri, a sun for Kuroko, and a star for Laika - before they saw him off. Kuroko had developed into a quiet, docile child and Kurogiri had developed into a confident, adventurous child.

The dragonkin made it routine to open letters and packages Hirato sent together in his absence. Oftentimes the packages were filled with trinkets and photo albums of the numerous archeological dig sites and tourist locations that fueled the twins’ wanderlust. In a few years time both had grown into ‘respectable little men’ in their mother’s words and had grown handsome in addition. They were scouted by a modeling agency and became acquainted with a designer intern who had taken a shine to them. Just as their careers took off the twins and their mother received news that their father had been killed in a freak accident.

The twins’ happy life of peace and comfort turned on its head instantly with their mother’s heartbreak and subsequent breakdown. At eighteen they were responsible for their mother’s health and the household. It was a hard time for all of them but they managed to hold it together with everything they had. Laika, who had grown ill and sickly from the loss, is recovering enough to move on her own and regain her strength.