Hi I will send what I have and see if anything fits with your line. Unfortunately the only thing I have on the Wyllie side is Christina.
James Young married Elizabeth Fulton (don't have any dates). They had a son Thomas Y. born 1820, Kilmarnock Parish. He married Helen Lockhart 1849, Dundonald. They had children James Thomas Y, Janet Y, John Y and Elizabeth Y.
James Thomas Y married Elizabeth Gemmill 1878 High Gainford Farm, Fenwick and had children Christina, Helen, Thomas, Andrew and Elizabeth.
Janet Y married John Currie 1875 Redding Farm, Kilmarnock (sometimes shown as Monkredding). They had children Ellen & Robert.
John Y married Margaret Service 1883 Towerhill Farm, Kilmaurs and had children Mary Miller Y, Thomas Y (my grandfather), Helen Lockhart Y, Margaret Service Y, William Service Y, John Y and Janet Y.