Yes, they are a lineal descendant. You share a common ancestor in a direct line. You are her grandparent.
Yes, she is your grand daughter.
Lineal descent is metaphorically in a straight line; a lineal descendant is the child of the child of the child (repeat as necessary) of your own child. It is not the child of your sister, and so forth.
Father or mother
Any woman over the age of sixteen, regardless of race or geographical residence, who is a lineal descendant or blood collateral descendant of a Confederate soldier may join the United Daughters of the Confederacy. Both lineal and collateral ancestors must be blood relations. A collateral ancestor is the brother of the applicant's lineal ancestor, i.e. an uncle of the applicant. The collateral ancestor, like the lineal ancestor, must have served the Confederacy honorably or rendered material aid or civil service to the Confederacy. Cousins or the husband of a blood aunt (great, great, etc. aunt) are not collateral ancestors.
Neither of Shakespeare's two daughters had granddaughters, although they both had children. The last living descendant of Shakespeare was his granddaughter Elizabeth.
No. A daughter-in-law is not related by blood. A lineal descendant, in legal usage, is a blood relative in the direct line of descent.The laws of intestacy recognize a legally adopted person as an heir at law for purposes of inheritance. For example, Vivien had three biological sons and one adopted daughter. They and their children are considered her descendants for purposes of inheritance. Their spouses are not.
A grandson or grandchild, or remoter lineal descendant., A cousin., The son of a brother or a sister, or of a brother-in-law or sister-in-law.
You should write daughter's if you are talking about one daughter, e.g. "it is my daughter's birthday tomorrow".You should write daughters' if you are talking about more than one daughter at the same time, e.g. "this is our daughters' bedroom, which they share".
Yes, my mother is a direct descendant of his daughter Grace Harrod. He had other daughters but only one son, Henry, who was unmarried.
direct descendant
The correct plural possessive form for "daughter's" is "daughters'."
The plural of daughter-in-law is daughters-in-law.
The plural form of the noun daughter-in-law is daughters-in-law.The plural possessive form is daughters-in-law's.Example: Both of my daughters-in-laws degrees are in education.