Happy to oblige.
In the DC Registers (1821-1861) at least 33 separate
mentions of individuals with the surname CHEW are listed. For Philip and John CHEW there are several Reg Nos that they are included in, some with wonderful follow-on notes.
Probably the best is:
REG NO. 2628 (Reg Vol 5, p 178) Certificate of Freedom, Recorded 23
June 1858... Dr. Harvey Lindsley swears that the following were born
free in the city of Washington: Philip R. CHEW, who is about 22 yrs
old; John W. CHEW, about 21 yrs old; Mary Elizabeth CHEW, about 20 yrs
old; and Adeline CHEW, about 18 yrs old. (FOLLOW-ON NOTES state:
"These are the children of John CHEW and Matilda CHEW." John was b in
MD, and Matilda was b in VA; kids b in D.C. Provine then goes on to
abtract the 1850 Census for the family headed by John and Matilda in
Ward 4, Vol 1, folio 312, (children: Philip, John W., Mary A [E].,
Adeline, Ellen, Daniel, James, Andrew and Henry) and the 1860 Census for them in Ward 4, Vol 2, page 361 (children: Philip, Mary, Adeline,
Daniel, Andrew, Joseph, Charlotte, Charles and Ida), and by 1860 they
own real property. The notes state that John CHEW's marriage register
shows his bride as Matilda MOGGEY on 17 May 1835.
Provine then abstracts the family living next door to John & Matilda on the Census in 1850, which is headed by Philip CHEW and his wife Anne CHEW (both b MD), probably parents of John CHEW, (other children:
William, Charlotte, Clarissa, and Julia - all b MD).
Marriage data for John W. CHEW (son of John & Matilda CHEW) is also
given as: bride: Frances DAY, on 10 Apr 1860. You will note that the names Philip and John keep cropping up, father to son. Also, check out a really weird possible spelling of CHEW as "FACHEW". Other Reg Nos involve the additional children named above.
In the Registrations that I read, the only place in MD which was
mentioned was Prince George's County... This included one for which the follow-on notes stated: "John CHEW's will was recorded in Prince
George's County, Maryland on 15 Nov 1815. For others in this region
freed by CHEW's will, see Provine, Registrations of Free
Negroes...Prince George's County."
If you have not already done so, I think that may be where you need to look :-)
Please let me know if you are unable to find Provine's books, and I will send some add'l information in a couple of weeks, but her notes point out her sources and lead one to them so well that you really may want to see it for yourself.
Best wishes, and I hope this is helpful to you.