Hi, Does anyone know of the Ulan family in Mornington, Victoria, AU?

I am looking for Louis and Jean Ulan. They had 3 children that I know of - Dan, Beverly and Jonathan. But I think Dan changed his last name from Ulan to Mercer.

I have been told that Louis had a brother named Sam Lansky and lived in England and another brother named Morry Alan, then maybe a brother by the name of Richard Harris who lived in Chicago, IL, USA.

I am helping a friend of mine work on her genealogy.