Paternity search in Delaware

So, nothing seems to be shaking loose in Indiana. Maybe I should shift my focus to Delaware.

Here's what I know. A James M. Dehorty is mentioned in the will of Thomas Dehorty of Murderkill Hundred, Kent County, Delaware, dated December, 1846. Thomas calls this James the son of Sarah Silivan, but does not identify his relationship to Thomas. I know from records in the Delaware Archives that Thomas married Margaret Reed, daughter of John Reed, in about 1792. John Reed's will confirms that he had grandchildren Mary(Dehorty) Cahall, William B. Dehorty, Elizabeth (Dehorty) Cubbage and a great grandchild Margaret Clark, who would be the daughter of Amy (Dehorty) Clark. So, there is a William B. Dehorty, son of Thomas. James M. named his first son William B. Dehorty. Could this be James' father? I have yet to find a record in Delaware or Maryland of William B. marrying anyone. William dies in or before 1831, when my James would be about 11-12 years old. Unfortunately, there is a problem. There does exist an Orphan's Court record in the Delaware Archives dated about 1884 that appears to be an effort to settle land that William left. And, it begins

"William Dehorty late of then Murderkill Hundred in the County and State aforesaid deceased departed this life intestate and without issue on or about the year AD 1831...."

Rats! This is a great bit of evidence, detailing the descendants of William's siblings, their marriages and even a divorce, but, there it is, he died intestate and without issue. Another dead end!

Why did Thomas leave James $100 in his will? How are they related?