With family tree being instituted on dixith.com, listed here are some relationship definitions (based on scientific Genealogical terminology).

For a true relationship to exist, there must be an ancestor who is common to both individuals.

• Ancestor is the person from whom you descend directly, such as a grandparent or great-grandparent.
• Descendant is the person who descends directly from you such as a grandson or great granddaughter.
• Lineal relations are those in direct line of ascent or descent, such as a grandfather or granddaughter.
• Collateral relations are those relatives who are linked by a common ancestor, such as aunts, uncles, and cousins.
• In-law is your connection by the law of marriage (as distinct from relatives by blood) in particular, your husband's or wife's relative and your own brother's wife or sister's husband.
• Siblings have parents in common.  Brothers and sisters are siblings.
• First cousin is your parent's brother's (or sister's) child.  {However, the first cousin's child is not your second cousin, as is often thought to be the case, but your first cousin once removed.}
• The child of the first cousin once removed is your first cousin twice removed, and his child your first cousin three times removed.
• Second cousin is your grandparent's brother's (or sister's) grandchild.  That second cousin's child is your second cousin once removed, his child your second cousin twice removed, and so on.
• Third cousin is your great-grandparent's brother's (or sister's) great-grandchild.  The third cousin's child is your third cousin once removed, his child your third cousin twice removed.
• Grandnephew (or grandniece) is the grandchild of your brother or sister.
• Great-aunt (or Great-uncle) is the sister or brother of your grandparent.

• Great-GrandAunt (or Great-GrandUncle) is the sister and brother of your great grandparents.

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