Rosamunda was the daughter of Sigismond Took.[1] She married Odovacar, future patriarch of the Bolger Family, and had two children: Fredegar and Estella. The couple and their children attended Bilbo’s Farewell Party in S.R.1401.[2

“As a token of her confidence, she told him he need no longer call
her, “Auntie.” The previous year, Bilbo had suggested that Frodo no
longer address him as, “Uncle,” if he wished. Plain, “Bilbo,” would
do. Frodo still called Bilbo, “Uncle,” now and then; it had become
too ingrained a habit. But, following suit, Rosamunda suggested Frodo
might call her, “Rosa,” or, “Rosamunda.” Frodo forgot, and called
her, “Auntie,” many times, but, within the space of an afternoon
tea, “Rosa,” she became.”

Rosamunda Bolger (née Took) was the mother of Fredegar “Fatty” Bolger
and Estella Brandybuck. She was married to Odovacar Bolger and was
known as Rosamunda…