re: William Houston bc.1672. Would he be son of William Houston of Craggs (Craigs / Cullybackey ) co. Antrim, N. Ireland, also of Castle Stewart, co. Tyrone, Ireland, and of Cottreoch, Whitehorn Parish, Wigtownshire, Scotland ?
The new PRONI on-line catalogue shows ref. T877/15, deed of conveyance of the Manor of Castle Stewart, co. Tyrone, Ireland, from the Earl of Suffolk, England (who m. Mary Stewart) to William Houston of Craggs (Craig / Cullybackey) who m. a Miss Stewart ?
Perhaps William Houston married about this date to Miss Stewart and it was a marriage settlement and William Houston of New Castle was b. about that time ?
Also in the new PRONI catalogue online D1618/15/2/43 there was a Capt. Huston / Houston c.1682 who had a nephew Danaldson / Donaldson. Was he the Donaldson, cousin of William Houston of New Castle Co, Delaware ?
Sometimes, in the 1600s elder sons had a number of properties, with their brothers or near family members residing on them as "caretakers".They would venture between estates in Scotland and Ireland necessitated by politics of the times.