Biography

Most likely mentioned in 18391111FMS_LMW. 
FMS writes: "Mrs De Witt has a young son – De Witt was here yesterday and seemed much pleased – he says he is nearly as large as Willie now."
Willie (WSJ) was born June 1839 making him approximately 5 months old, so for this child to be "nearly as large as Willie now" it too much be very young. Sarah and Richard Dewitt did have sons, however all that are listed, would be too old at the time to fit this description. Their only child fitting the age requirement is Justina Dewitt, born in 1839 and died 1840, most likely FMS is incorrect in saying "Mrs De Witt has a young son."