Smalls, and Cummings - Descendants of Martin and Ross

This researcher needs to ascertain; how he and Sherlana Cummings are immediate relatives.  He proposes Jacob Martin and George Eleazer Ross as the most recent common ancestors.  Who are the other immediate relatives? 
According to FTDNA Sherlana Cummings and Allick Sancho shared 504.58 cM of DNA with 164.38 cM being the largest segment. 
It was said George Eleazer Ross and Jacob Martin bequeathed their DNA on some thirty five occasions which resulted in birthing of children. Perhaps, Sherlana Cummings, her mother and her grandmother, are great-niece, niece and sister of this enquiring mind.  Also, perhaps,  Grace Smalls is the grandmother, and Ingrid Cummings is the mother. 
Perhaps you will point this researcher to your family historians – soonest.
Are Aubrey Cummings, the singer -guitarist, Justice Percival Cummings and Professor Leslie P Cummings, members of this Cummings kinship? 
Are members of this Cummings kinship linked to people at Plaisance, and Lichfield?
Are you aware of Louis Jervis?
Are you aware of your relatives using GEDmatch? 
Perhaps, you will send MLilwana Osanku contact information of Cummings and Smalls family historians.  
This researcher emailed the content above to Smalls, and Cummings. He was not previously aware of  Casey A Smalls, and Sherlana Cummings as definitive names of DNA relatives. He is certain Muriel Sancho told him George Ross has numerous children older than George Ross, her son. It is possible Grace Smalls is one of them. It is also possible Grace Smalls could be a daughter of Jacob Martin. Perhaps, Smalls or Cummings is the grandson of Jacob Martin who bequeathed his DNA to a female in 1980 and did not raise the child. 
If you did DNA testing; please upload your RawDNA to GEDmatch. If you used AncestryDNA and/or 23andMe Please check DNA matches with Mlilwana Osanku. 

On FamilyTreeDNA and/or MyHeritage please check DNA matches with Allick Sancho. 
This researcher needs the names of the parents and grandparents of Jacob Martin. 
Long Live George Eleazer Ross 

Long Live Jacob Martin