Article 743 of the French Civil Code
In the direct line, as many degrees are counted as there are generations between the persons: thus, the child is, with regard to the father and mother, in the first degree, the grandson or granddaughter in the second; and conversely the father and mother with regard to the child and the forefathers with regard to the grandson or granddaughter; and so on. In collateral lines, the degrees are counted by…