I imagine his widowed sister Mahala Brady Wilson helped Brad raise the kids; he and Rebecca plus children lived with her in 1850 and in 1860 he and the triplets,plus a son,still lived with Mahala. Rebecca died in 1851 and in 1852 Brad married Frances Purvis, who died before 1860 with no children. In 1862 he married Nancy Hancock.
Rebecca's mother was Susannah "Sukey" Garner and her dad was Abednego Maness, a triplet.Rebecca's sister Mary Elizabeth (Betsy) also had two children with Brad,possibly three, although she and Brad did not marry.