The only VANDERSLICE name I have is John Vanderslice and he is listed in the 1850 Census for Philadelphia, PA - 3 Ward Kensington, with his daughter (Matilda in census) Margaret is the name I have for her though and her husband (David Mintzer).
John Vanderslice was listed as 49 years old. So that would mean b. 1801
1850 49 1801
Not listed in their household in the 1860 Census for Philadelphia, PA - 20th Ward Philadelphia City.
That is the only VANDERSLICE information that I have.