Many thanks for your suggestions; I shall follow up on them. Your comment that David would be less common name to follow up does make sense. Both David and John were able to sign their applications for permission to occupy land in Bruce Co.; some of their neighbours were unable. By the time I was asking abt any siblings of David and John who remained in Ire. no one in the family knew. David and John spent a few years in Simcoe Co before the land in Bruce Co., became available to new settlers. David met his wife to be,Jane Walker, in Simcoe where she had been born.Many in Simcoe Co., including the Walkers, had come from Co. Tyrone.