Disregarding all canon, I think Basilio and Flavia would be good as relatives to Claude. Like, they are connected through his Alymran family. As soon as they heard he was born they were excited to see him. Though their meeting was short and Claude cant remember it, they wanted to do their best to help him through his life. They would send him books, documents, weapons, trinkets, ect in their letter for him. They also promised he would always have them to rely on should he even need them.
They definitely seem like the kind of people who would be around Claude if his mother, Judith ans Nader are anything to go by xD












