Have wondered if you've been able to find out any more info on your Grassick family member.I have much info on the Grassicks of Strathdon who emigrated about 1856 to Manhattan, New York and later moved to Maywood, Bergen County, New Jersey (abt 1885).
There was a German Grassick family living in Bergen County, New Jersey during the 1850s, possibly later, I have not followed their history.
I do have one branch of the Grassicks living in Westchester County, New York, but have not had much luck with finding info on several of the daughters of Thomas Grassick 1862-1907 and Elizabeth Hatch 1863-bef 1916.Except for oldest son Thomas, 1886-1887 b/d Manhattan, their children were born in Mount Vernon: Helen 1887-?; Jennie 1891-?; Ida 1891-?; George 1894-1894; Jessie 1896-1936 Poughkeepsie (single); Edwin 1898-1975 Phoenix Arizona, accountant, married to Sankie Ora Williams, unknown when they married but believed not to have had any children; Infant 1900-1900.
I also know from researching the Ellis Island site that there was a family Gressick that emigrated to NY from Scotland and settled in the Westchester, New York vicinity.No other info on them.