Katie, I find your John, wife Anna, and daughter Marie arriving in Baltimore on May 4, 1874 sailing on board the Nurnberg.
Also, I find that your John Lusk was born on Sept 1, 1841, in Skocice, near Vodnany, Strakonice District, Southern Bohemia, in House # 11, to Wojtech Lusk who is the son of Frantisek Lusk and Katerina Tesar, and wife Anna who is the daughter of Antonin Blaha. Antonin Blaha is the son of Jan (John) Blaha of Razice. Anna Blaha born July 8, 1813 in Budicovice, house # 6.
Wojtech Lusk married Katerina Tesar on August 19, 1834 in Skocice. Wojtech Lusk born March 28, 1815.
John married on May 25, 1871 according to his birth record, but I've yet to find the actually marriage.
Hope this helps you to get started on your tree.
I'm not related.