Grands-parents.
A tree is "un arbre" (masc.) in French.
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A quadrilateral family tree is one with four lines of descent. It traces the ancestry of all four of a person's grandparents.
Hindi ko alm ehh..............
A family tree is "un arbre généalogique" in French.
The format of a family tree is the same regardless of what language you use.
You can say "Árbol genealógico".
Cousins will show up as the children of your parent's brothers and sisters. You would want to show a descendant tree of your grandparents.
You can make a family tree for any plant or animal that ever lived, but only if you know their parents, grandparents, etc. This information is not usually available for an insect like a scorpion, so a family tree is not usually possible.
Arbre généalogique
They would be listed at the same level as your mother or father, because they are the children of your grandparents.
Geneology is basically family history. This means it is researching someone's family tree to find out as much as possible about parents grandparents and further back.