Checked the US census images, Michael and Amanda on 1900 and 1910, 3208 Dillon street. Amanda, head, widow, owns home, is on 1920 census, same address, living with cousin Joseph Kemp 31 and Anna 30, brother Thomas Webb 28, Veronica Webb 24, and Carrie Webb 6. 1930 census, Thomas Webb 38, Veronica 34, Carrie 17, plus other children living on Hudson Baltimore. One family tree on ancestry.com has a Thomas Webb b.abt 1892 marrying Veronica Pierce.
There is no WW I draft card for Michael Pierce, so checked Baltimore City directories and state archives vital records; last year in directory for him is 1916; death record is Cert#C-92496 Feb 16, 1916 Baltimore City. Amanda is in city directory until 1922; death record is Cert#D-56290 Aug 18, 1921 Baltimore City.