In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.
The gender specific noun for the son of one's child is grandson.
The gender specific noun for the daughter of one's child is granddaughter.
The feminine form of alumnus is alumna. The feminine plural is alumnae.
The feminine form of bajo is baja. The feminine plural is bajas.
The feminine form of ami is amie. The feminine plural is amies.
The feminine form of a baron is a baroness.
The plural possessive form of "grandson" is "grandsons'".
its grande :)
The possessive form is grandson's.
The feminine form of ami is amie. The feminine plural is amies.
Mistress is the feminine form of master. It is already in feminine form.
The feminine form of a baron is a baroness.
The feminine form of alumnus is alumna. The feminine plural is alumnae.
The feminine form of charmant is charmante. The feminine plural is charmantes.
The feminine form of bajo is baja. The feminine plural is bajas.
The feminine form of benefactor is benefactress.
The feminine form of groom is bride. The female partner in a marriage.
The feminine form of the name Ronald is Ronaldine.
The feminine form of grandfather is grandmother.