Ballantyne Sewell had 4 children.

1. Susannah Sewell 1808
2. Eliza Catharine Sewell 1825
3. Sarah Doyle 1826
4. Thomas Doyle 1826

His first child was with wife Elizabeth and last 3 with Catharine Doyle. Why would the last 2 be given the surname Doyle when Ballantyne is namedtheir father at their baptisms and Eliza was given the surname Sewell? To complicate this Sarah used Sewell as her maiden name when she married. Ballantyne died in 1846. Any ideas?