We think that Kristjan Gross is my husbands gr grandfather. His son Peter emigrated to New Zealand in 1909 and had one son John Peter Groos ( somewhere along the line the surname spelling has been changed from Gross to Groos. Hence why it has taken so long to make the connection.
Perter's sister Marie and youngest sister Leno both emigrated to Australia along with Leno's daughter Hildegard.
All we had to go on was the names Kristjan and Anna Groos (Lullis) which also appears now to be Jullis)