Zidane Wilson was the only son alive of his parents; he was born with a twin that didn't survive, and his mother Valeria Wilson nee Gauss was left unable to conceive anymore after the experience.
He sincerely loved Dana, and more than that, respected her as her own person - had that not been the case she wouldn't have given him the time of day.
Dana Wilson of the Rostand was the only daughter Narcissa and Godwin had, and therefore the Rostand Heiress despite not being interested in those duties.
She had the option to marry her husband and adopt him into her name, but choose to take the longest route to accomplish her mother's wishes for a noble status. Already from her childhood she had been an enterprising woman, busying herself with exploring as well as weaving and knitting.
She discovered the joys of crafting fine jewelry when she was pregant with her first son, and went on to becoming the most important crafter of the Kingdom, and her many friendships with other travelers made it so her name was known in may other countries and states, adding on to her fame.
Nivyen Wilson of the Rostand shared a torrid relationship with the Royal Prince Wolfgang Van Hook, and far more importantly, a romantic one with him too.
Driven, ambitious, WarriorKing for most of his life and also Dragoon of the Kingdom, his friendship with both his lover and this one's older sister, Queen Melanie Van Hook, made it very easy for him to accomplish what had been his grandmother's dream: granting the Rostand Family the status of nobility.
That is not to say that he neglected his family - while very busy, Nivyen made it a point to regularly speak with his children, never looking to demand more of them than what they could give. a part of that could be landed at his parents' feet: Zidane was never content with his level, despite being WarriorKing, and Dana was too busy with her comissions to ever spend any impactful deal of time with him during his childhood.
Nivyen was mostly raised by his four grandparents, with Rafita and Narcissa taking great merit in the accomplished General he later became.
Ninive Diego nee Wilson was, one could say, his parents' favourite child, as they made time to play with him the same way they wouldn't with Nivyen, but his older brother never really faulted him for it, keeping close ties till he died.
He's not considered part of a branch family because although he did marry Anita Diego, daughter of two travelers sponsored by the Rostand and the Wilson, she was not a traveler herself.