'Thomas Merrick, born in Wales, 1620, came to America in the year 1636 with three brothers and probably one sister, Sarah Mirick, who married John Atkinson, at Newbury, 1646. … Thomas Merrick died September 7, 1704.'
The Sarah Mirricke/Myrick who married John Atkinson (1636-1715) in Newbury did so in 1664 [Torrey; Newbury VR 2:20 (John Atkins/Attkinson and Sara Mirricke)], not 1646, and thus is unlikely to be a sister to Thomas.