A few records about Isaac Gottlieb and his family that perhaps might interest you,
Marriage record (March 1892)
Death record (Nov 1945) - mother's name is probably wrong
Birth record of daughter Jennie (1894)
Birth record of son Benjamin (1896)
I am almost certain that this is his Declaration of intention (1907) - according to the 1910 census he had filed first papers although, apparently, he did not complete the procedure - Isaac Gottlieb, born in 1867 in Austria, arrival in 1890, occupation tailor, residence Brooklyn very close to the address they were living per the 1905 census. (attached)
According to this document he sailed from Hamburg
Hope that helped.