A fallen gravestone, marked only with the initials J.B., in the woods that have overtaken a graveyard for Black youth in Cheltenham. (Photo by William J. Ford/Maryland Matters)The House Government, Labor and Elections Committee voted unanimously Tuesday to advance Senate Bill 776, a bill that would create a Commission on the House of Reformation and Instruction for Colored Children. The bill, sponsored by Sen. William C. Smith Jr. (D-Montgomery)…