Seth married Sybil Case on 10 Apr 1783 in Granby, Hartford Co., Connecticut, USA. Sybil (daughter of Martin Case and Lucy Adams) was born on 5 Jun 1765 in Simsbury, Hartford Co., CT; and died. [Group Sheet] [Family Chart]

1. Sybil Hillyer was born on 19 May 1786; died on 9 Aug 1803.
2. Seth Hillyer was born on 17 Jun 1788; and died.
3. Chloe Hillyer was born on 6 May 1790; and died.
4. Lora Hillyer was born on 7 Sep 1792; and died.
5. Tacy Hillyer was born on 9 Sep 1794; and died.
6. Harriet Hillyer was born on 1 Feb 1797; and died.
7. Alma Hillyer was born on 12 May 1799; and died.