Olive Welby was the da. of Richard Welby and Frances (Bulkley) Welby. Through her mother she has a single badged trail to Saher de Quincy from the BULKELEY entry. Through her father she is connected to the Bigods (Hugh le Bigod and Roger le Bigod) from the WELBY entry.
Back in 2017, the G2G "Anyone interested in lines from Olive (Welby) Farwell to 12 M.C. surety barons other than Saher de Quincy" covered some of this territory but other than confirming some of the facts nothing much changed.
Last year I reorganized my notes into a space: Magna Carta Lines of Olive (Welby) Farwell and went through our copy of MCA (1st ed.) which shows lines to Aubeney, Bigods, Bohun, Clares, Clavering/FitzRobert, Lacy, Malet, Mowbray, Quincy and Roos. She's not connected to Huntingfield, Lanvallei, Say or de Vere. She has a connection to Robert FitzWalter but I haven't written it down yet.
I've decided to make this public for now so other people can assist. I don't have access to RA and I'm probably not going to be able to assist after the end of March. The main thing I was going to finish was add at least three more lines (FitzWalter, Nettlestead and Neville), add the rest of the links and citations.