Hi Marty - You may already have this, but on HeritageQuest I found Lansing in the 1870 Fed. Census.
1870 Fed. Census - state:NY county- Kings
Ward - 20
LANSING, D.L. 35y occupation: Stationer
LANSING, Anna K. 32y
LANSING, John B. 2/12 y
LANSING, Elizabeth 4y
Lansing did do a lot with his name didn't he, unless the enumerator simply totally misunderstood and messed up.
On the GGG site, in the NYC Death Index, possibly found wife Anna:
LAMBERT, Anna 63y d. May 13,1902 Kings co.
cert. # 8547
Seems to fit, though might not be right Anna.