I have a copy of Samuel Brillhart's will and he makes mention of a Juliana that he raised and intermarried with Jacob Kraft. I cannot say with all certainty that this is his daughter, but possible. Secondly through a form for Sons of the American Revolution it appears that he had a son Samuel Brillhart III.
I have not done a lot with the Brillhart family, but am looking into them because of the Danner link and that my Jacob Etter went from Virginia to Pennsylvania to address his wife's inheritance from the Brillhart will. Jacob & Elizabeth are from the area, and this is as far back as I have my family line so I am trying to find them in Pennsylvania and his parents/family.
If you are interested in copies of the Will send me your e-mail and I will send them. Mine is firstname.lastname@example.org