beauty on Family Tree Circles

My grandmother was born in Newry County Down. Her name was Margaret Cochrane. She married James Thomson in 1914 at St Cuthberts Glasgow. My grannie's father was Joseph Cochrane and he married Sarah Gracy. Margaret's siblings were Robert, Elisabeth, and joseph. They all grew up in Glasgow. I think Robert was the eldest and i think he was also born in ireland. Lost all trace. They surely have descendants somewhere?